A woman holds a small puppy in her arms
A woman holds a small puppy in her arms

When to Start Your Puppy on Heartworm Disease Prevention

When caring for your brand-new puppy, heartworm disease prevention should be a top priority. The American Heartworm Society (AHS) recommends that you start your puppy on heartworm prevention at no later than 8 weeks of age.1 Heartworm prevention for puppies is critical, as puppies can become infected with heartworms via a bite from an infected mosquito on the first day of their life. HEARTGARD® Plus (ivermectin/pyrantel) is approved as safe for puppies as young as 6 weeks.
  Once your puppy is on a heartworm disease preventive, continue to give your dog the delicious real-beef HEARTGARD Plus chew each month, all year long, to ensure full protection from the risk of heartworm disease.      
A golden retriever puppy sits in the backyard

Can Puppies Get Heartworms?

Yes. Heartworms are transmitted by mosquitoes—if an infected mosquito bites your puppy, your puppy is at risk of developing heartworm disease. Once infected, the heartworm larvae will develop into adult heartworms over the next 6 to 7 months.2 These heartworms can cause permanent scarring of the vessels and the lungs even prior to the dog testing positive.

A woman pets her golden retriever puppy

Can Puppies Get Heartworms Even in Cold Climates?

Heartworm disease happens in all climates, in all 50 states, and at any time during the year.3 The infection is caused by parasites that are transmitted by mosquitoes.2,3 Heartworms don’t discriminate based on age—your young pup is just as likely as an older dog to contract heartworm disease. Because of this, a heartworm disease preventive is one of the most important monthly medications for all dogs, just like flea and tick protection.   HEARTGARD Plus chews are the #1 vet-recommended real-beef chew that prevents heartworm disease in puppies and adult dogs.4  

How to Know if Your Puppy Has Heartworms

Heartworm disease can only be detected by a blood test, which can be administered by your veterinarian. Here are some symptoms of advanced heartworm disease in puppies and dogs.5

1
Persistent Cough. The presence of heartworms in the lungs can lead to a dry, unproductive cough in dogs.
2
Reluctance to Exercise. Lethargy is a common sign of heartworm infection in dogs.
3
Decreased Appetite and Weight Loss. Your dog may find it difficult to complete normal tasks, like eating, in the advanced stages of heartworm disease. This can also lead to weight loss.
4
Swollen Belly. In life-threatening cases, dogs may exhibit a swollen belly due to fluid buildup in the abdomen.
— SIGNS OF HEARTWORM DISEASE —
A brown puppy is coughing
A yellow lab lays on the floor
A dog with ribs showing
A small puppy with a large belly

The best way to prevent heartworm disease is to get your dog started on a preventive early, administer every month, and have them tested yearly by your veterinarian. Starting your puppy on HEARTGARD Plus chews from an early age will help prevent heartworm disease and treat and control other intestinal parasites.

Learn More
A woman is about to feed her puppy a Heartgard treat

The Importance of Heartworm Disease Prevention for Puppies

Heartworm disease can be deadly, but heartworm prevention for puppies is easy with HEARTGARD Plus Chews. Beginning heartworm prevention early is critical if you want to give your dog a long and healthy life.
Starting heartworm prevention early shouldn’t be your only focus—it’s equally important to administer the preventive every month, and all year long.

Get Heartworm Disease Prevention from Your Vet

HEARTGARD Plus chews are #1 vet-recommended for a reason.1 Once your dog has a negative heartworm test and prescription from your vet, you can purchase HEARTGARD Plus chews in clinic or through their online pharmacy. Use the search tool below to get started.

Find your vet to ask for HEARTGARD Plus chews

›

    Protect your dog against the invisible threat.

    Get HEARTGARD Plus Chews