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Black spots are merely pigment and can appear anywhere. Sometimes a pet will have several black spots in the mouth, other times just one or a few and also a pet can have an all black mouth or a black mouth with pink spots. Mixed breeds as well as purebreds often have black spots in their mouths.It's totally normal. I recall when a very young neighbor of mine asked her Mommy what the black spots meant. Her Mommy said it meant that their pet was very smart and very special.