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Why does my cat's tail puff up after kidney fluids? Is it normal?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 8 lbs

Today we gave our cat his usual dose of drip/fluids for his kidneys. I noticed that afterwards his tail become fuzzy,like when normaly fights. (photo attached) Is it normal?

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1 Answer

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on February 4th, 2018

The hair on the tail and body (most commonly along the back) can stand up with any kind of stimulation. We most commonly see this in cats when they are fighting or playing and are very mentally stimulated, but it can also occur with other kinds of physical stimulation including some internal stimulation (which might be what happended when you gave him his fluids). I would suspect that the hair on the tail will go down relatively quickly. It may or may not occur when you give fluids again in the future. I hope that was helpful and answered your question. Thanks for using Petco Pet Education Center, formerly Petcoach.

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