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Why does my dog have brown fur discoloration on paws and mouth?

Updated on September 23rd, 2025

Pet's info: Dog | West Highland White Terrier | Male | neutered

Hi, I have a 13 year old west highland terrier that has a brownish fur discoloration on his paws and mouth

1 Answer

Most Helpful Answer

Dr. Strydom, DVM

Answered By Dr. Strydom, DVM

Veterinarian

Published on July 23rd, 2017

That discoloration is a porphyrin staining. Dogs have this stain in their saliva normally. Curly is obviously licking his paws most likely due to an underlying allergy. Seasonal and non-seasonal environmental and food allergies can cause a pet to lick or chew on the feet, knees, or other body parts. Inflammation can also be caused by items embedded in the skin, painful joints, flea bites, etc.

The staining around the mouth is most likely due to a dental infection. More saliva is produced in attempt to rid the bacteria from being absorbed through the gums into the bloodstream.

I would recommend you try this shampoo:

https://www.target.com/p/veterinary-formula-clinical-care-hot-spot-itch-relief-pet-shampoo-16-oz/-/A-50298965#lnk=sametab

Really though, Curly should have a vet exam so his mouth can be evaluated and the allergies can be addressed (if it is allergy related).

I hope this helps. Best wishes.
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