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All the latest deals, news and more > Pet Pharmacy > Heartworm > Item # 496974

Heartgard Dog Chewables

Prescription Required

Eligible for free e-certification with purchase
up to 25 lbs


In Stock. Usually Ships 3-6 business days.

25 to 50 lbs


In Stock. Usually Ships 3-6 business days.

51 to 100 lbs


In Stock. Usually Ships 3-6 business days.

Shipping weight = 1.00 lb.


Sometimes, manufacturers require that products be advertised only at their suggested prices. When we choose to sell these items for less, we display the sale price only in the cart. To see the price, click Add to Cart.


All medications are filled by VetSource Pharmacy. More information. Can only be shipped to the 50 US states.

Product Summary:

 Heartgard Chewable Canine
Heartgard Chewables are a once a month beef-flavored chewable that can protect your dog from the threat of potentially deadly heartworm disease. Heartgard Chewables are approved for use in puppies as young as 6 weeks, small dogs regardless of weight, pregnant or breeding dogs, and Collies. Dogs 6 months of age and older should be tested for heartworm disease prior to being put on a preventive program and tested annually thereafter. VetSource pharmacy has a direct relationship with and is authorized to dispense Merial products.
Heartgard is used to prevent heartworm infections.
For use:
Dogs (at least 6 weeks of age)
SM (Blue) for dogs up to 25 lbs
MD (Green) for dogs 26-50 lbs
LG (Brown) for dogs 51-100 lbs
6 tablets
Active ingredient(s):
There are no known drug interactions with ivermectin. It is best to always tell your veterinarian what other medications you are giving to your pet. Quite often your veterinarian may prescribe two different medications, and a drug interaction may be anticipated. In this case, your veterinarian may vary the dose and/or monitor your pet more closely. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.
 Allergic reactions to medications may occur. Be sure to inform VetSource and your veterinarian if your pet has any known drug sensitivities or allergies. If your pet displays symptoms of an allergic reaction, call your veterinarian immediately or go to a veterinary emergency clinic. Symptoms may include but are not limited to: swollen lips, tongue, face, airways; difficulty breathing; agitation; profuse salivation; vomiting; widespread hives and itching.
Side effects:
There are very few side effects when the drug is given at the usual dose. Ivermectin may rarely cause a shock like reaction in dogs. If this occurs, notify your veterinarian. If you notice anything unusual, contact your veterinarian.
Heartgard Chewables should be given orally as directed by your veterinarian.
Please note:

We are not a licensed pharmacy.


This prescription product or therapeutic food is fulfilled by VetSource, a licensed pharmacy in all 50 US states.  VetSource only ships to the 50 US states. 


To order prescription products or therapeutic foods  from VetSource you must have an existing, valid veterinarian-client-patient relationship.  Prescription requests are subject to a Drug Utilization Review by a licensed pharmacist at VetSource for patient safety.


All prescription products (excluding therapeutic food) are FDA approved, or EPA licensed, to be sold in the US.


Prescription products cannot be returned. 

Downloadable Resources
Patient Information SheetPatient Information Sheet

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