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Do puppies need heartworm medicine vital protection

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November 6, 2025

Do puppies need heartworm medicine is a question that echoes in the minds of many devoted pet parents, and the answer is a resounding yes. It’s not merely a suggestion; it’s a crucial cornerstone of responsible puppy ownership, a shield against a silent, potentially devastating invader that can infiltrate even the most sheltered young lives.

This exploration delves into the very heart of the matter, unraveling the insidious lifecycle of the heartworm parasite and illuminating how the delicate systems of puppies make them exceptionally susceptible to its ravages. We’ll uncover the common pathways of transmission, painting a vivid picture of how these microscopic menaces find their way into our beloved companions, and examine the physical toll these worms exact on a growing puppy’s body, a stark reminder of the stakes involved.

Understanding Heartworm Disease in Puppies

As a new puppy parent, your mind is probably buzzing with questions about their health and well-being. One of the most crucial topics to get a handle on early is heartworm disease. It’s a serious, potentially fatal condition that affects dogs, and puppies are especially susceptible. Understanding how it works is the first step in protecting your furry friend.Heartworm disease is caused by a parasitic roundworm calledDirofilaria immitis*.

These worms live in the heart, lungs, and associated blood vessels of infected animals, making it difficult for them to breathe and for their heart to pump blood effectively. The disease is preventable, but if left untreated, it can cause significant damage and even lead to death.

The Heartworm Lifecycle

The journey of a heartworm is complex and fascinating, involving both mosquitoes and your dog. It’s a cycle that begins with an infected mosquito and ends with adult worms residing in your puppy’s heart.The lifecycle starts when a mosquito bites an infected dog and ingests the microscopic baby heartworms, known as microfilariae. Inside the mosquito, these microfilariae mature into infective larvae.

When this infected mosquito then bites another dog, these infective larvae are transmitted into the new dog’s bloodstream.Once inside the puppy, these larvae travel through the body, eventually reaching the heart and lungs. Over the next few months, they mature into adult heartworms. Adult heartworms can live for several years, producing more microfilariae, which then circulate in the puppy’s blood, ready to be picked up by another mosquito and continue the cycle.

Puppies’ Vulnerability to Heartworm Infections

Puppies are at a critical disadvantage when it comes to heartworm disease. Their developing bodies are less equipped to fight off infections, and the effects of the worms can be devastatingly rapid.Because puppies have smaller bodies and developing organ systems, even a small number of heartworms can cause significant damage. Their immune systems are also still maturing, making them less able to mount an effective defense against the parasite.

This means that an infection can progress more quickly and have more severe consequences compared to an adult dog.

Common Transmission Methods to Young Dogs

The primary way puppies contract heartworm disease is through the bite of an infected mosquito. There are no other common ways for transmission to occur, which simplifies prevention strategies but highlights the importance of mosquito control.Heartworm larvae are transmitted through the saliva of infected mosquitoes during a blood meal. This means that if a mosquito has fed on a dog with heartworms, it can then transmit the larvae to your puppy when it bites them.

The prevalence of mosquitoes in your area directly correlates with the risk of heartworm transmission.

Physical Characteristics of Heartworms and Their Impact

Adult heartworms are long, spaghetti-like worms that can grow up to 12 inches in length. In a puppy, these worms can quickly overwhelm their cardiovascular system.The adult heartworms reside in the pulmonary arteries and the right side of the heart. As more worms accumulate, they can obstruct blood flow, leading to increased blood pressure in the lungs (pulmonary hypertension) and strain on the heart.

The physical presence of heartworms in a puppy’s heart and lungs can lead to symptoms such as coughing, exercise intolerance, weight loss, and even congestive heart failure.

In severe cases, the worms can block blood vessels, causing damage to vital organs. The sheer number of worms in a small body can be incredibly detrimental, impacting their growth and overall health.

The Necessity of Preventative Medication: Do Puppies Need Heartworm Medicine

As loving pet parents, we all want the best for our furry companions, and that includes protecting them from serious health threats. When it comes to heartworm, especially for our young pups, prevention isn’t just a good idea – it’s absolutely crucial. Understanding why preventative medication is so vital for puppies will help you make informed decisions to safeguard their health for years to come.Heartworm disease is a potentially fatal parasitic infection that is transmitted through mosquito bites.

Puppies, with their developing immune systems and boundless energy, are particularly vulnerable. Starting preventative medication early in a puppy’s life is the most effective way to shield them from this insidious disease and its devastating consequences.

Comprehensive Overview of Why Puppies Require Heartworm Preventative

Puppies are born without heartworms, but they are susceptible from a very young age, often as early as 6-8 weeks old. The preventative medications work by killing the immature stages of the heartworm parasite before they can mature and cause significant damage. This is far more effective and humane than trying to treat an established infection. By administering preventatives regularly, we essentially create a shield around our puppies, ensuring that any microscopic larvae that enter their bodies are eliminated before they can even begin to develop into adult worms.

Risks Associated with Delaying or Skipping Preventative Treatments for Puppies

Delaying or skipping heartworm preventative treatments for puppies opens the door to a cascade of serious health issues. The most immediate risk is the establishment of heartworm infection. Once infected, the larvae migrate through the puppy’s body, eventually reaching the heart and pulmonary arteries where they mature into adult worms. This process can begin within a few months of infection, and by the time symptoms become apparent, significant damage may have already occurred.Skipping preventatives can also lead to:

  • Increased susceptibility to other parasites: Many heartworm preventatives also offer protection against common intestinal parasites, which can further compromise a puppy’s health.
  • Higher risk of severe symptoms: Puppies with developing immune systems may experience more severe clinical signs if infected.
  • Potential for irreversible damage: Even if the infection is eventually treated, the damage to the heart and lungs may be permanent.

Long-Term Health Consequences of Untreated Heartworm in Adult Dogs That Started as Puppies

The repercussions of heartworm infection contracted as a puppy can cast a long shadow over a dog’s entire life. If left untreated, adult heartworms can live for several years within a dog’s circulatory system, causing progressive damage. This damage isn’t limited to the heart and lungs; it can affect other organs as well.The long-term consequences include:

  • Chronic heart failure: The constant presence of adult worms and the inflammation they cause leads to a weakening of the heart muscle and valves.
  • Pulmonary hypertension: The increased pressure in the lung’s blood vessels can lead to breathing difficulties and exercise intolerance.
  • Organ damage: The kidneys, liver, and even the brain can be affected by the reduced blood flow and inflammation caused by heartworms.
  • Reduced lifespan: Dogs that have suffered from untreated heartworm disease often have a significantly shorter lifespan and a lower quality of life.

A dog that was infected as a puppy and never received proper treatment may face a lifetime of health complications, requiring ongoing veterinary care and potentially leading to a premature end.

Cost-Effectiveness of Preventative Medication Versus Treating Advanced Heartworm Disease

When we look at the financial aspect, the choice between prevention and treatment becomes starkly clear. Preventative heartworm medication is remarkably cost-effective when compared to the expense of treating advanced heartworm disease.Let’s break it down:

  • Preventative Medication: The cost of monthly or yearly heartworm preventatives is relatively low. For example, a year’s supply of most reputable preventatives can range from $50 to $150, depending on the brand and the dog’s weight. This is a small investment for significant protection.
  • Heartworm Treatment: Treating advanced heartworm disease is a complex, lengthy, and costly process. It typically involves:
    • Diagnostic tests (blood tests, X-rays, echocardiograms) to assess the severity of the infection.
    • A series of injections to kill the adult worms, which can be painful and have potential side effects.
    • Medications to manage symptoms and prevent complications.
    • Strict rest periods for the dog, often for several months, which can be challenging for active dogs and their owners.

    The total cost for treating heartworm disease can easily run into hundreds, if not thousands, of dollars, not to mention the significant emotional toll on both the pet and the owner.

Prevention is always less expensive than cure. This adage holds profoundly true for heartworm disease in dogs.

The small, consistent investment in preventative medication saves owners from the exorbitant costs and the potential heartbreak associated with treating a life-threatening illness that could have been avoided.

Types of Heartworm Preventatives for Puppies

Navigating the world of heartworm prevention for your new furry family member can seem a bit overwhelming with all the options out there. Fortunately, there’s a range of safe and effective preventative medications specifically designed for puppies, ensuring they get a healthy start free from this dangerous parasite. The key is to work closely with your veterinarian to choose the best option for your individual puppy’s needs and lifestyle.These preventative medications are designed to kill immature heartworms before they can mature and cause significant damage to your puppy’s heart and lungs.

Regular administration is crucial, as missing doses can leave your puppy vulnerable. Understanding the different types available will empower you to make informed decisions and maintain your puppy’s well-being.

Heartworm Preventative Categories and Administration Methods

Heartworm preventatives come in several convenient forms, each with its own advantages. The choice often depends on your puppy’s age, temperament, and your personal preference for administering medication.

Here’s a breakdown of the common categories and how they’re given:

  • Oral Chewables: These are flavored and often resemble treats, making them a popular choice for picky eaters or puppies who are easily stressed by other forms of medication. They are typically given once a month.
  • Oral Tablets: Similar to chewables, these are small pills that can be given directly or hidden in a small amount of food or a pill pocket. They are also usually administered monthly.
  • Topical Solutions: Applied directly to the skin, typically between the shoulder blades, these solutions are absorbed into the bloodstream. This method is beneficial for puppies who have difficulty taking oral medications or for owners who prefer not to administer pills. They are generally applied monthly.
  • Injectable Medications: Some heartworm preventatives are available as long-acting injections that can protect your puppy for six months or even a full year. This is a highly convenient option for owners who might forget monthly doses, but it requires a veterinary visit for administration.

Typical Dosage Guidelines for Puppies

Dosage for heartworm preventatives is meticulously calculated to ensure efficacy and safety for young, growing dogs. These guidelines are primarily based on your puppy’s weight, with age also being a consideration, especially for very young puppies who may require specific formulations.

It is absolutely critical to follow your veterinarian’s prescribed dosage. Overdosing can be harmful, while underdosing can render the medication ineffective. Always consult your vet for the exact amount and frequency for your specific puppy.

“Puppy heartworm medication dosages are weight-based to ensure accurate and safe treatment.”

Indeed, little pups require diligent care, and that includes vital heartworm medication. Understanding how to obtain these prescriptions is key, and many wonder can pawp prescribe medicine for your furry friends. Rest assured, ensuring your puppy receives necessary heartworm prevention is a blessing for their health.

While specific dosages vary greatly by product and manufacturer, a general guideline for puppies is that they are typically started on heartworm prevention as early as 6-8 weeks of age. The medication will be adjusted as the puppy grows and gains weight. For example, a very small puppy might start on a dose for 2-4 pounds, and then as they grow to 5-10 pounds, they would move to the next weight class dosage.

This ensures they are always adequately protected.

Common Active Ingredients in Puppy Heartworm Medications

The effectiveness of heartworm preventatives lies in their active ingredients, which target and eliminate the heartworm larvae. Understanding these ingredients can help you have more informed discussions with your veterinarian about the best preventative for your puppy.

Most heartworm preventatives contain one or more of the following active ingredients:

Active Ingredient Mechanism of Action Common Forms
Milbemycin Oxime Kills microfilariae (larval stage) and intestinal parasites. Oral chewables, oral tablets
Moxidectin Kills microfilariae and certain other parasites. Oral chewables, topical solutions, injectable (often combined with other ingredients)
Ivermectin Kills microfilariae and other parasites. Oral tablets, topical solutions (less common for puppies now due to newer formulations)
Selamectin Kills microfilariae and provides broad-spectrum protection against fleas, ticks, and other parasites. Topical solutions

Many modern heartworm preventatives are also combination products, meaning they protect against heartworms as well as other common parasites like fleas, ticks, and intestinal worms. These all-in-one solutions offer convenience and comprehensive protection for your puppy.

When to Start Heartworm Prevention

Starting heartworm prevention for your puppy is a crucial step in protecting their health, and timing is everything. It’s not a one-size-fits-all answer, and what’s best for your furry friend depends on a few key factors. Getting this right from the start sets them up for a long, healthy life free from the dangers of heartworm disease.The decision of when to begin heartworm preventative medication should always be made in consultation with your veterinarian.

They are the best resource to guide you based on your puppy’s individual health, breed predispositions, and the prevalence of heartworm in your geographical area.

Veterinary Consultation for Preventative Regimens

Before administering any heartworm preventative, a conversation with your veterinarian is paramount. They will assess your puppy’s overall health, discuss potential risks, and recommend the safest and most effective product for your specific situation. This ensures that the medication is appropriate for your puppy’s age, weight, and any existing health conditions.

“A proactive approach to heartworm prevention, guided by veterinary expertise, is the most effective strategy for safeguarding your puppy’s future well-being.”

Heartworm Testing for Puppies

It is a standard recommendation to test puppies for heartworm infection before starting preventative medication, especially if they are over six months of age or their heartworm status is unknown. This test is a simple blood draw that detects the presence of adult heartworms or their microfilariae (larval offspring). If a puppy tests positive, they will require treatment for the existing infection before starting on preventative medication to avoid potentially life-threatening complications.The process typically involves:

  • A blood sample being collected by your veterinarian.
  • The sample being sent to a laboratory for analysis.
  • Results usually available within a few days to a week.

This testing ensures that you are not administering preventative medication to a puppy who is already infected, which could lead to severe adverse reactions.

Preventative History for Adopted Puppies, Do puppies need heartworm medicine

Puppies adopted from shelters or those with unknown backgrounds present a unique consideration for heartworm prevention. It’s essential to inquire about any previous preventative care they may have received. Often, shelters provide initial vaccinations and deworming, but heartworm prevention history can be less clear.When bringing an adopted puppy home, prioritize a veterinary visit. Your vet will:

  • Discuss the puppy’s known history with you.
  • Perform a thorough physical examination.
  • Recommend appropriate testing for heartworm and other common puppy ailments.
  • Establish a heartworm prevention schedule tailored to their circumstances, which may include an initial heartworm test regardless of age to be absolutely certain.

Understanding their past helps your veterinarian make informed decisions about their current and future health management, ensuring they receive the best possible start with you.

Potential Side Effects and Considerations

Starting any new medication, including heartworm preventatives, can sometimes bring about a few bumps in the road for our furry companions. While these medications are generally very safe and overwhelmingly beneficial, it’s good to be aware of what to look out for and how to handle any unexpected reactions. Our priority is always our puppy’s well-being, and being informed is the first step to ensuring they stay healthy and happy.It’s important to remember that most puppies tolerate heartworm preventatives exceptionally well.

However, like with any medication, individual sensitivities can occur. Understanding these potential side effects and knowing how to respond can save you and your vet valuable time and worry. This section aims to equip you with that knowledge, ensuring you can confidently manage your puppy’s health journey.

Common Side Effects of Heartworm Medication

While serious adverse reactions are rare, some puppies might experience mild, temporary side effects when they first start heartworm medication. These are usually a sign that their system is adjusting to the medication. It’s helpful to be observant during the initial period after administering the preventative.Here are some of the more commonly reported, mild side effects:

  • Gastrointestinal Upset: This can manifest as mild vomiting, diarrhea, or a decreased appetite. These symptoms are often transient and resolve on their own within a day or two.
  • Lethargy: Some puppies might seem a little more tired or less energetic than usual for a short period. This is typically mild and short-lived.
  • Drowsiness: A temporary feeling of sleepiness can occur in some puppies, similar to mild lethargy.
  • Mild Allergic Reactions: In very rare cases, a puppy might develop a localized reaction at the injection site (if using a injectable preventative) such as mild swelling or redness, or a minor skin rash.

Managing Adverse Reactions

Should your puppy experience a reaction that concerns you, prompt action is key. It’s always best to err on the side of caution and contact your veterinarian if you notice anything unusual or if symptoms are severe or persistent. They are your best resource for accurate diagnosis and treatment.Here’s a guide on what to do if your puppy has an adverse reaction:

  • Observe and Document: Carefully note down all the symptoms you are seeing, including when they started, how severe they are, and how long they have lasted. This detailed information will be invaluable for your vet.
  • Contact Your Veterinarian Immediately: Do not hesitate to call your vet. Describe the symptoms clearly and provide them with the information you’ve documented. They will advise you on the next steps, which may include bringing your puppy in for an examination.
  • Do Not Administer Further Doses: Until you have spoken with your vet and received clearance, do not give your puppy another dose of the heartworm preventative.
  • Follow Veterinary Advice: Your vet may recommend discontinuing the current medication and trying a different type of preventative, or they may suggest supportive care to manage the symptoms.

“The best defense against heartworm disease is consistent, year-round prevention.”

The Importance of Consistent Administration

Maintaining a regular schedule for administering heartworm preventatives is absolutely critical for their effectiveness. Heartworm preventatives work by killing immature heartworm larvae before they can mature and cause significant damage. If doses are missed or given inconsistently, there will be gaps in protection, allowing these larvae to develop.This consistent administration ensures that your puppy is protected against infection at all times.

For example, if a monthly chewable is missed, the window of protection can be compromised. The efficacy of these medications relies on having a continuous level of protection in the puppy’s system.

Factors Affecting Preventative Effectiveness

While heartworm preventatives are highly effective, several factors can potentially influence their performance. Understanding these can help ensure your puppy receives the maximum benefit from their medication.Here are some key factors to consider:

  • Inconsistent Dosing: As mentioned, missing doses or administering them late is the most significant factor that can reduce effectiveness. A consistent monthly or yearly schedule is paramount.
  • Incorrect Dosage: Ensuring your puppy receives the correct dosage for their current weight is vital. Puppies grow rapidly, and their weight can change significantly, necessitating dose adjustments. Always consult your vet for accurate dosing based on current weight.
  • Storage and Handling: Some preventatives, particularly certain injectable forms or refrigerated medications, require specific storage conditions. Improper storage can degrade the medication, rendering it less effective. Always follow the manufacturer’s and veterinarian’s storage instructions.
  • Puppy’s Health Status: While preventatives are safe for most puppies, a puppy that is already infected with heartworms may not tolerate the medication well, and it may not be fully effective in clearing an existing infection. This is why a heartworm test is often recommended before starting prevention, especially for puppies over a certain age or those with unknown histories.
  • Parasite Resistance (Rare but Possible): While very uncommon, there is a theoretical possibility of parasite resistance developing over extended periods in certain geographic areas. However, current research suggests this is not a widespread issue with approved heartworm preventatives. Rotating or changing preventatives as recommended by your vet can be a prudent measure.

The Role of Veterinary Professionals

Our furry companions are more than just pets; they’re family. As responsible pet parents, we rely heavily on the expertise of veterinarians to ensure our puppies grow into healthy, happy adults. When it comes to something as serious as heartworm disease, their role becomes even more critical, from diagnosis to treatment and ongoing prevention.Veterinarians are the frontline defense against heartworm disease in puppies.

They possess the knowledge and tools to accurately identify the presence of these dangerous parasites, even in their earliest stages, and to implement effective treatment plans when necessary. Their guidance is indispensable in navigating the complexities of heartworm prevention and ensuring your puppy receives the best possible care.

Heartworm Disease Diagnosis in Puppies

Diagnosing heartworm disease in puppies requires a keen eye and specialized veterinary tools. The signs of heartworm infection can be subtle in young dogs, making professional evaluation essential. Veterinarians employ a multi-faceted approach to confirm a diagnosis, ensuring accuracy and timely intervention.Veterinarians utilize several diagnostic tools and procedures to detect heartworm infections in puppies. These methods are designed to identify the presence of adult heartworms, microfilariae (larval offspring), or evidence of the damage these parasites inflict on the heart and lungs.

  • Blood Tests: This is the cornerstone of heartworm diagnosis. Veterinarians typically perform antigen tests, which detect proteins produced by adult female heartworms. These tests are highly sensitive and can often detect infections early on. They may also conduct microfilariae tests, which look for the larval stage of the parasite in the blood.
  • Physical Examination: During a routine check-up, your veterinarian will listen to your puppy’s heart and lungs with a stethoscope. Abnormalities such as murmurs, irregular heartbeats, or coughing can be indicators of heartworm disease.
  • Diagnostic Imaging: If a blood test is positive or if symptoms are present, veterinarians may recommend chest X-rays or an echocardiogram (ultrasound of the heart). These imaging techniques allow them to visualize the heart and lungs, assess the extent of damage caused by heartworms, and sometimes even see the worms themselves.

Heartworm Treatment Protocols for Puppies

When a puppy is diagnosed with heartworm disease, the treatment process is carefully managed by a veterinarian. The goal is to safely eliminate the adult heartworms and their offspring while minimizing the risks associated with the treatment itself. It’s important to understand that treating heartworm disease in puppies is more complex and potentially riskier than in adult dogs due to their smaller size and developing bodies.Treatment protocols for puppies diagnosed with heartworm disease are tailored to the individual puppy’s health status, age, and the severity of the infection.

The process is often multi-phased and requires strict adherence to veterinary instructions.

The primary objective of heartworm treatment is to kill the adult worms and prevent further damage to the heart and lungs.

The treatment typically involves the following steps:

  1. Stabilization: Before administering medication to kill the heartworms, the veterinarian will assess the puppy’s overall health. If the puppy is experiencing significant heart or lung issues, they may need supportive care, such as medications to manage heart failure or improve breathing, to stabilize them.
  2. Adulticide Treatment: This involves administering medications, usually an arsenic-based drug called melarsomine dihydrochloride, to kill the adult heartworms residing in the heart and pulmonary arteries. This is typically given in a series of injections.
  3. Microfilariae Treatment: Once the adult worms are dead, the veterinarian will treat for the microfilariae to prevent them from developing into adult worms. This often involves a different medication, such as ivermectin or milbemycin oxime, which may be administered concurrently with or shortly after the adulticide treatment.
  4. Post-Treatment Monitoring: After the treatment course is complete, regular follow-up appointments and blood tests are crucial to ensure all heartworms have been eliminated and to monitor for any complications.

It’s crucial to note that the treatment for heartworm disease can have serious side effects, including allergic reactions, lung embolisms, and liver or kidney damage. This is why it’s paramount that treatment is conducted under strict veterinary supervision.

Veterinary Check-ups for Puppy Health Monitoring

Regular veterinary check-ups are the bedrock of a puppy’s long-term health and well-being. These appointments are not just for vaccinations; they are comprehensive evaluations that allow your veterinarian to monitor your puppy’s growth, development, and overall health status. Early detection of potential issues, including heartworm infection, is a key benefit of these routine visits.The importance of regular veterinary check-ups for monitoring puppy health and preventative care cannot be overstated.

These visits provide a proactive approach to safeguarding your puppy’s future health.

  • Early Detection of Health Issues: Veterinarians can identify subtle signs of illness or developmental problems that might go unnoticed by the owner. This early detection allows for prompt intervention, often leading to better outcomes and less invasive treatments.
  • Vaccination and Deworming Schedules: Check-ups ensure your puppy stays up-to-date on essential vaccinations to protect them from dangerous diseases and on deworming protocols to prevent internal parasites, including heartworms.
  • Nutritional and Behavioral Guidance: Veterinarians can offer personalized advice on the best nutrition for your growing puppy and help address any behavioral concerns that may arise.
  • Establishing a Baseline for Health: Regular visits create a health record for your puppy, providing a baseline against which future health changes can be compared. This is invaluable for diagnosing and treating any conditions that may develop.
  • Preventative Care Discussion: These appointments are the ideal time to discuss and reinforce heartworm prevention strategies, ensuring you have the most current and effective preventative medication for your puppy’s specific needs and lifestyle.

Final Thoughts

Ultimately, the conversation around do puppies need heartworm medicine culminates in a clear understanding: prevention is not just the best medicine, it’s the only responsible course of action. By embracing timely and consistent preventative care, guided by the wisdom of veterinary professionals, we not only safeguard our puppies from the grim realities of heartworm disease but also invest in a future filled with robust health and joyful companionship, a future where the whispers of worry are replaced by the happy barks of a thriving dog.

Questions Often Asked

What is the earliest age a puppy can start heartworm medication?

Most veterinarians recommend starting heartworm prevention for puppies as early as 6 to 8 weeks of age, though this can vary based on the specific product and your vet’s assessment.

Can a puppy get heartworms from its mother?

While it’s rare, it is possible for heartworm larvae to be transmitted from an infected mother to her puppies through the placenta.

Are there any natural or holistic alternatives to heartworm medication?

Currently, there are no scientifically proven natural or holistic alternatives that effectively prevent heartworm disease. Relying on unproven methods can put your puppy at serious risk.

What happens if I miss a dose of my puppy’s heartworm medicine?

Missing a dose can leave your puppy vulnerable. It’s crucial to consult your veterinarian immediately to determine the best course of action, which may include a heartworm test and restarting the preventative regimen.

Do puppies living indoors need heartworm medication?

Yes, even indoor puppies need heartworm medication. Mosquitoes, the primary carriers of heartworm, can easily enter homes, making no puppy completely safe from potential exposure.