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Is dog diarrhea normal during heartworm treatment? When to worry?

Updated On September 23rd, 2025

My rescue is being treated for heartworms is diarrhea normal and when should I worry and call his vet? He has already had 2 injections, 1 left

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on May 4th, 2016

Diarrhea can be normal after Immiticide injections, especially if he is also currently on steroids (often used concurrently to reduce inflammation and chances of embolisms). You should worry if you see signs of coughing, extreme lethargy, pale gums, not eating, or any random bleeding episodes. Other than that a little loose stool is not very concerning for a severe reaction. You can try a bland diet of boiled plain chicken and rice or cottage cheese tonight to help settle the stomach. If the diarrhea continues past 12-24 hrs then antibiotics +/- probiotics may be prescribed by your vet to help get the intestinal flora back to normal status.

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