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My cat has bloody, loose stools after deworming. What's wrong?

Updated On September 23rd, 2025

Pet's info: Cat | Persian | Male | unneutered | 3 years and 4 months old | 4.59 lbs

My cat's poop has blood in it lately. He's had loose stools for about 2 weeks now, which was when he was dewormed. I started him on these probiotics three days ago. He's eating his food but he doesn't finish it in one sitting. He usually finishes it quickly. He's been pooping a lot too for the past few days. But the blood only showed up prominently today. Both the photos of the poop were from today. I've changed his food from all wet food to dry food in the morning and wet food at night.

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1 Answer

Most Helpful Answer

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Answered By Jessica Keay, DVM

Veterinarian

Published on June 27th, 2018

I am sorry to hear about your kitty! With blood present I think it is time for a vet exam (and bring a stool sample along). We can have intestinal parasites that are not treated by dewormer (such as Coccidia and Giardia). We can also have things like colitis, inflammatory bowel disease, or food allergy cause these issues. The vet can examine your kitty and based on the exam and history make recommendations and possible test and treatment options.

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