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My kitten has diarrhea and red anus after deworming. Should I worry?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Male | unneutered

Hi, my 8-9 week old kitten went through deworming with 2 doses and 2 weeks after the first dose he began having diarrhea once a day, now about a week after the second dose his anus sometimes is red and so far he has not had a poop today, the red looks like inside his anus and it's only about the size of a pen tip, I only seen it once today and he doesn't seem to be in any pain and he is acting normal and playful, I have a 2nd kitten that was dewormed and he is not experiencing anything

3 Answers

Most Helpful Answer

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Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on August 8th, 2017

Hi there and thanks for using Petco Pet Education Center, formerly Petcoach. There are many causes to diarrhea with a red perhaps inflamed anus. Parasites could be the cause or a bacterial or viral infection. I would take your kitten to your veterinarian soon for a fecal test where they will test his stool for parasites and bacteria and/or certain viruses that could be causing the diarrhea. They may Rx a medication to your kitten depending on what the veterinarian discovers on the fecal test. Best of luck! I hope this has helped.

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    Answered By Sara Farmer, DVM

    Veterinarian

    Published on June 8th, 2018

    Even though Coco has been dewormed twice she could still have intestinal parasites like coccidia that would not be susceptible to standard dewormers. Other causes of diarrhea include infections or food sensitivities. I would recommend seeing a vet for a fecal analysis. If it is normal you can discuss diet changes that could help, like increasing fiber or trying a limited ingredient diet.

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on May 14th, 2019

    Congrats on your new kitten, but I’m sorry Salem has diarrhea. If he had worms and was given a deworming treatment, then you can see more diarrhea due to the dead worms being passed. The diarrhea should improve, but if it doesn’t in the next 24-48 hours, then I would take him back into the vet. I hope this helps.

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