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Why do my dogs have diarrhea but act normal after negative vet tests?

Updated On September 23rd, 2025

My two dogs have been having diarrhea for the past 2 weeks. They both have diarrhea but act completely normal. They eat food, drink water, play, go to the bathroom regularly and the only problem is that their poop is diarrhea. So I went to the vet and the doctor said might have Giardia, so we sent a poop sample to check for Giardia, or other bacteria and parasites. The tests came back negative and there is nothing wrong with them, but they still have diarrhea. Also it’s not their food.

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on January 2nd, 2019

You mentioned it isn't their food, but didn't give any mention of if you've tried switching to other foods or seeing if there is a common ingredient that could be causing digestive upset. I wouldn't rule out food just yet if you haven't tried a food trial or other option to try and reduce the diarrhea. Probiotics can also be useful in chronic diarrhea for helping the GI tract improve. These are available from your vet and may help firm up the stool. Plain yogurt (not fat-free or sugar-free) and a little pumpkin puree can also help add in some fiber and probitiocs to firm up loose stool. A third possibility could be they both got into something they shouldn't have (such as garbage or a critter outside) which could have caused the diarrhea. A bland diet can help if you suspect this is the case until their stools return to normal. If the diarrhea continues, a more thorough workup from your vet is best.

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