Is your dog a yorkie? I've seen mottled colored dogs have gums that were brown and pink, almost like the brown was a darkening of pigment, but nothing was wrong with the dog.
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Some brown pigmentation to patches of skin on the dog's gums and tongue are normal. But if your dog has brick red gums (which indicate heat stroke), yellow gums (which indicate jaundice) or blue gums (which indicate cyanosis, a lack of oxygen in the blood) then this is cause for serious concern and an immediate visit to the veterinary clinic.
Read more: How to Check a Dog's Gums | eHow.com How to Check a Dog's Gums | eHow.com |