My dog has diarrhea after Heartgard and vet visit. Is it normal?
Updated On September 23rd, 2025
Pet's info: Dog | Shih Tzu | Male | unneutered | 1 year and 11 months old | 13 lbs
Can heartgard cause a dog to do diarrhea? Look at the pics please!! I gave him heartgard at 10 am at the vet when we got home at 11:50!he did the restroom like this? Is this normal?! I called his vet and sent him picture he said it was normal but I want to make sure..
2 Answers
Most Helpful Answer
Published on August 29th, 2017
Hello, & thank you for using Petco Pet Education Center, formerly Petcoach. I do not think you have anything to worry about. The stool could look this way more from the stress of the veterinary visit, than from the Heartgard. It can take approximately 8 hours from the time a substance is swallowed to the time it is passed back out, so I very much doubt that the medication caused this. Now, if Max had vomited within 30 minutes or so of swallowing the Heartgard, then I would say this is the probable cause. So, as long as he is eating & drinking regular, & his stool does not get looser, then he will be perfectly fine.
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Related Answers from Veterinarians
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Published on March 3rd, 2020
I suggest you give him the Heartgard. The benefits of him ingesting the Heartgard far outweigh the risks (some loose stools). If you give it this time and it happens again then you can pretty much assume the Heartgard is the cause and then you can speak to your vet about using a different product like a topical (Revolution or Advantage Multi). You can sometimes minimize GI upset by giving the Heartgard with a full meal.
1Pet Parents found this answer helpful
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