Brown spots on gums?

Kovi has brown on her gums. They have always been that way. Her teeth are very clean, I brush them regularly. Is it normal for dogs to have different colors on their gums or should they be all pink?

Both my dog's gums are mottled, so it's quite normal.

Sometimes my dogs get more spots but it is bruising from chewing on bones.

^ ouch.

a lot of dogs have mottled gums, depending on their colouring, i think.