Black spots on a dog’s tongue can look alarming if you’ve never seen them before, but in many cases they are completely normal. The most common explanation is natural pigmentation. Just as people can have freckles or darker patches of skin, dogs can develop areas of extra pigment on their tongues, gums, lips, or inside their mouths. These spots may be present from a young age or become more noticeable as the dog gets older. Certain breeds, including Chow Chows and Shar-Peis, are especially famous for dark tongues, but mixed breeds and many other dogs can have isolated black or blue-black spots too.
Normal pigmentation is usually flat, smooth, and the same texture as the surrounding tongue. If your newly adopted dog is otherwise acting healthy, eating normally, drinking, and showing no signs of pain, a few dark spots are often nothing to worry about. They don’t automatically mean the dog has a disease, poor circulation, or some unusual breed mix. In fact, many perfectly healthy dogs have these markings throughout their lives without any problems.
Still, it’s worth paying attention to changes. A spot that suddenly appears, grows quickly, becomes raised, bleeds, develops an irregular surface, or seems painful should be checked by a veterinarian. The same is true if your dog develops bad breath, difficulty eating, excessive drooling, swelling, or unexplained weight loss. Those symptoms can point to dental problems, injury, infection, or, more rarely, an abnormal growth that needs professional evaluation.
So if the spots are flat and have probably been there for a while, they are most likely harmless pigmentation. Since the dog is newly adopted and you may not know his full medical history, mentioning the spots during his next routine veterinary exam is still a smart idea. In most cases, though, those mysterious black marks are simply one more unique feature that makes your dog look like himself.
