Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Why are my cat's nails dark, black, or look like dried blood?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 5 years and 4 months old | 11.7 lbs

My cat has the basis of several nails dark, black, as if they were dirty or with brown blood

1 Answer

Most Helpful Answer

Sara Farmer, DVM

Answered By Sara Farmer, DVM

Veterinarian

Published on July 1st, 2017

This can be a sign of a fungal infection of the nail base. If the nails do not appear normal it could also be a sign of certain autoimmune nail diseases. I would recommend seeing a veterinarian - ringworm is one type of fungus that could cause an infection and the treatment is very different from a yeast fungal infection so your veterinarian may want to run some tests. If there are changes to the nail or paw pads your veterinarian may want to take a sample for biopsy to rule out immune diseases like pemphigus.
Vote Icon9Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button