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Why is my cat lethargic with bloody stool after antibiotic?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 1 month and 3 days old | 0.8 lbs

Diarrhea treatment continued. Again today, the antibiotic vaccine was given by the veterinarian . and then I didn't see a problem with the food . Six hours later, loss of appetite began. Even though there's a cat who normally likes to play games , he's not playing right now. There is a difference in color ,smell and fluidity in the stool compared to the yesterday . There are red spots in the stool .Looks like cat food or blood . Yesterday pic : 1 (dark) Now pic : 2 Cat food pic : 3

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1 Answer

Most Helpful Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on June 11th, 2019

The progression of the diarrhea from yesterday to today appears to be a little better (it looks like there is a lot of blood in the stool in the first picture). I would continue with your vet's treatment plan.

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