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My dog has bloody, watery diarrhea and is losing weight. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | Bull Terrier | Female | unspayed | 3 years and 2 months old | 28 lbs

My bull terrier Sasha, she is 3 years old, started having diarea about a week ago. I had just changed the brand of food I was giving her so I just thought that was all it was so I put her back on her normal food and she was still having diarea. Next I thought it could be worms causing it so I wormed her about 4 days ago and she still has diarea. Today I just noticed that she had blood in her diarea and I'm not sure what could be causing it. Her diarea is watery and she is losing waight.

1 Answer

Most Helpful Answer

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Answered By Sara Farmer, DVM

Veterinarian

Published on October 17th, 2018

Diarrhea can be due to bacterial overgrowth in the colon, liver or pancreatic disease, or parasites that are not covered by a typical dewormer. If you are seeing blood you should definitely make an appointment to see a vet. They may want to check a stool sample or even check some blood work.

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