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Why is my dog still having bloody diarrhea after parasite meds?

Updated On September 23rd, 2025

Pet's info: Dog | Airedale Terrier | Male | unneutered | 2 years and 9 months old | 140 lbs

My dog has have bloody direhea a vet told me that it might be parasites and I gave him medcine and it didnt work

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on October 17th, 2018

Bloody diarrhea can be caused by intestinal parasites, a parvo virus infection, severe intestinal infection, an injury in the colon or rectum, or have an idiopathic reason (ie , we can't find a cause). You will need to take your dog back to the vet for a recheck as he likely will need antibiotic treatment to prevent him from getting sepsis. The medicine against parasites takes at least two to three days to work before the bleeding stops so if your dog only started receiving it yesterday or today I suggest you wait another day before going back to the vet as it may kick in before then.

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