Heartgard Chewables for Dogs
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Heartgard® Chewables for Dogs (Brand) by Merial

Heartgard® Chewables for Dogs (Brand) <em>by Merial</em>
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Please Note: If intestinal parasites are a concern, please make certain that you order Heartgard Plus, which is labeled to prevent heartworm disease and to treat and control ascarids (roundworms) and hookworms in dogs.
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Frequently Asked Questions

Q.  How is Heartgard different than Heartgard Plus?
A.  Heartgard is designed for the elimination of heartworms. Heartgard Plus also contains an ingredient called Pyrantel which eliminates large roundworms and hookworms in addition to heartworms.

Q.  What is heartworm disease and why is it bad for my dog?
A.  Adult heartworms lay very tiny larvae called microfilariae, which enter the animal's skin when an infected mosquito bites the animal. When the larvae reach about 3 inches, they migrate to the animal's heart where they grow into adults, sometimes reaching a length of 14 inches.

Severely infected dogs can have up to several hundred heartworms in their hearts and vessels. The adult worms can obstruct the different chambers of the heart as well as the various large blood vessels leading to and from the heart and lungs. In severe infections, other organs, such as the liver, can also be damaged.

Q.  Does my dog need a test before I start giving him Heartgard?
A.  The American Heartworm Society advises that all adult dogs being started on a heartworm preventative for the first time be tested. After that, periodic, but not necessarily annual re-testing should be performed. The frequency of testing should take into account variables such as:
  • Prevalence of heartworm disease in the area
  • Missed or late doses of heartworm preventative
  • The dog's lifestyle
In areas where the mosquito season in not year-round, puppies born after the mosquito season do not need to be tested. For instance, in Northern Wisconsin, puppies born in January do not need to be tested. Consult with your veterinarian to determine the appropriate testing schedule for your dog.

Q.  Can I give my dog a chewable if he does not chew treats?
A.  Chewables should be chewed and not swallowed, so if your dog is a “gulper”, either choose the tablets or break up the chewables into smaller pieces when you give them to your dog If the dose or any part of it is rejected, re-dosing is recommended. Consult your veterinarian if your dog is a Collie or other herding breed.

Q.  How often should I give this medication to my dog?
A.  Heartgard tablets and Heartgard chewables are meant to be given every 30 days. When you start your dog on Heartgard, make sure to give it to him on the same day every month. Use the convenient heart stickers included in the package to put on to your calendar to remind you of the monthly date.

Q.  When should I start giving my dog Heartgard during the year?
A.  Remember that Heartgard kills larvae your dog was exposed to in the preceding 30 days, so if you give your dog a preventative seasonally, give it to him a month after the first mosquito appears.

Q.  What if I miss a dose?
A.  If the interval between doses exceeds 30 days, ivermectin's efficacy can be reduced. Therefore, if you miss a dose, give the Heartgard as soon as you remember that you missed it. We also recommend that testing the dog for heartworm infection 6-1/2 months after the missed dose.

Q.  I have heard that Collies and other herding breeds have trouble with ivermectin. What can you tell me about this?
A.  Collies or other herding breeds may have a reaction to ivermectin if given over the recommended heartworm prevention dose. The manufacturer states the product should be safe in these breeds if used as recommended however, if your dog is one of these breeds, and your veterinarian has prescribed Heartgard Plus, observe your pet for at least 8 hours after giving the medication for weakness, staggering, dilated pupils, trembling, drooling, or pressing the head against a wall. Contact your veterinarian immediately if you see these signs.

Q.  When should I start giving my puppy Heartgard?
A.  You can start giving Heartgard after your puppy reaches 6 weeks of age.

Q.  What if I want to protect my dog against intestinal worms as well as heartworm?
A.  Consider Heartgard Plus if you wish to protect your dog from large roundworms and hookworms. Heartgard Plus contains pyrantel in addition to ivermectin, which has been shown to be effective in the removal of certain intestinal worms.

Drs Foster and Smith Articles

Heartworm Disease: The Cost of Treatment
Although heartworm is treatable, it may result in serious complications. No matter what it costs in dollars, the cost is even greater to the long-term health of your pet.
Heartworm FAQs
Frequently Asked Questions about Heartworm
Cases From Our Clinic: Heartworm Disease
Heartworm, or Dirofilaria immitus disease is seen in all 50 states. Follow this case from our clinic to see how one dog owner dealt with this devastating disease.
See All Articles

Rx Information

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1 ADD your pet's medication to your Shopping Cart.
2 ANSWER a few questions about your prescription
3 CHECK OUT – We'll take care of the rest – even
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Pharmacy Hours:
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Sat. 9:00 a.m. - 1:00 p.m. CST

If you have any questions, feel free to call us at 1-800-447-3021 or email us.
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  • If you are emailing us: please allow up to a 12 hour response time.

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our WI License Number is: 8266-042

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