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Q: Has Anyone Had a Dog React Badly to Heartguard tablets?

May 2, 2010 | By Debra B. | 6 answers | Expired: 1582 days ago

Debra B.

I have a rescue dog, between 1-2 years old, who was blood tested for heartworm in Dec. 2009 by the rescue and I had tested in late Mar. 2010. The Mar blood test was negative. In my area, dogs are not treated year round for heartworm, usually May through Nov. I am getting ready to administer his first dose and want to know what things I should look out for if he has a bad reaction to the Heartguard tablet.

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Kelly
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May 10, 2010

I've never had a dog have a bad reaction to Heartgard & here, they stay on it year-round. Heartworm is pretty bad around here & many of the rescues are HW+. Cassidy was positive & had a horrible reaction to the second phase of the HW treatment & almost died, but she's always tolerated the Heartgard Plus just fine. Right now I have three taking it every 30 days. The only thing I've noticed is that some dogs will have soft stools for a couple of days after taking it when they first start it. That usually goes away once they get used to the treatment. There is an injectible called Proheart 6 that is good for 6 months, but when it was first put on the market, there were major problems with it. Many dogs died. They pulled it & then reintroduced it, but there are still questions about its safety.

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Danis
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May 05, 2010

I also have never had a dog have an allergic reaction to heartworm medication. I suppose there is always a chance that a dog would be allergic to either the medication itself, or the other ingredients since some have flavorings and color added etc....I looked up some info on the 1-800-petmeds website, and they said allergic reactions were more common when the pet received vaccines and their heartworm med on the same day. And also that if your pet is allergic to some of the other ingredients, like beef, soy, dairy, you may want to switch to a topical like Revolution. I don't know how effective Revolution is for heartworm as compared to any kind of oral agent.

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Linda B.
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May 03, 2010

My Suzy got into her supply of Heartguard and took three or four doses at once. I called the vet and they said the pills are very safe, even with multiple doses at once.

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Jillian
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May 02, 2010

though i've heard of dogs occasionally having a bad reaction, i've never known a dog personally to have one. some dogs are sensitive to ivermectin, but the heartworm dose is usually not enough to cause problems. b/c it's your first time giving it to him, just do it when you'll be home all or most of the day.

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Nancy C.
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May 02, 2010

I always used Interceptor and have not heard of any bad reactions to Heartguard. Since your dog is healthy (no heartworms) there should be no problems. Some dogs get stomach upset when they first start medications so look out for that. It should not be severe or long lasting. If it is call your vet ASAP. Every dog and breed is unique and can react differently to medicines. A lot like people. Keep an eye on your pup for the first couple of days but more than likely nothing will happen. Its better to give heart worm preventitives than to risk getting heartworm. Heartworm is terrible on dogs its very painful.....and is preventable. Your doing the right thing for your dog.

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Ethel02
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May 02, 2010

If your Vet has tested and said he does not have heartworm, I would use what the Vet gave me, I use Interceptor, if your dog had heartworm I think it's kinda of fast to be over it, it is a long & painful ordeal, if you pet has a chance of still having it, any heartworm medicine can kill him.

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