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My dog still has diarrhea after fenbendazole. What to do now?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 2 lbs

John has have diarrhea so I gave him fenbendazole, 50mg each day for 3 days, but he still have diarrhea now 3 days after the 3-day treatment. What to do now? Another 3-day treatment of Fenbendazole, or start 7-days treatment of Metronidazole?

1 Answer

Most Helpful Answer

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Answered By Dr. Davis

Veterinarian

Published on September 19th, 2017

The diarrhea may be from his diet or stress as it has not improved. The fenbendazole is for treating parasites. There is no reason to do that again. Using a course of metronidazole is fine but I would make sure he's on a bland diet, and you can add a tablespoon of canned pumpkin at each meal to increase the fiber and bulk up the poop. If he should stop eating or the diarrhea continues please take John in for a veterinary exam, fecal test and treatment. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for John.

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