Your Dog's Tongue as a Measure of Her Health
Flat, black pigmented areas on your dog’s tongue and gums or inside the lips and mouth are perfectly normal. These dark areas are a result of microscopic melanin granules and are nothing to worry about. Often as a dog ages, these melanin areas tend to grow or change shape.
What isn’t normal is a dark area that’s not flat, but is raised above the surrounding tissues. If you notice any type of dark, pigmented tissue on your dog’s tongue, lips, or anywhere inside the mouth that looks like a bump or is raised instead of flat, it’s important to have your veterinarian look at it right away. It could be a melanoma.