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My dog has Giardia. Why is his diarrhea not going away with meds?

Updated on September 23rd, 2025

Pet's info: Dog | Siberian Husky | Male | unneutered | 5 months and 19 days old | 32 lbs

Hello my dog was diagnosed with guardian two weeks ago and weve been giving him metronidazole 250 mg twice a day since the diagnosis but he still has diarrhea

1 Answer

Most Helpful Answer

Lauren Kennedy, DVM

Answered By Lauren Kennedy, DVM

Veterinarian

Published on December 1st, 2017

Ths can be a tricky disease to get rid of. The diarrhea caused by Giardia can lead to colitis, an inflammation in the bowel wall, which can make the diarrhea worse and/or persist despite the treatment.

You will need to make sure you are cleaning up all of Kenai’s feces daily so that he does not become reinfected. It may also be helpful to ask your veterinarian about adding a probiotic to Kenai’s treatment plan. This can help the diarrhea clear up more quickly. And finally, it may be worth retesting Kenai’s feces to make sure nothing else is going on. He may need an additional antibiotic to help clear up the diarrhea.

I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.
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