black gums on labrador

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My Dog Dixie is a Black Lab, she may be mixed got her from North Shore about 3 years ago. I know she has black on her tongue. Never notices her gums before, till the Vet said she has tartar. She had stones in her bladder and is on a special diet. Last night I opened her mouth and noticed her gums were completely black. She is healthy now and playful. Now i see on this that Labs do have black gums. It was a shock when i saw her gums