Why do some dogs have black spots on their tongue suddenly?

Basically any dog can have spots on it's tongue. It is most similar to a freckle on a human. However, while any dog, mutt or purebred, can have a spot as they are meaningless the following breeds are more inclined to have them: * Airedale

* Akita

* Australian Cattle Dog

* Australian Shepherd

* Belgian Sheepdog

* Belgian Tervuren

* Belgian Malinois

* Bichon Frise

* Bouvier de Flandres

* Bull Mastiff

* Cairn Terrier

* Chinese Shar-Pei

* Collie

* Cocker Spaniel

* Dalmatian

* Doberman Pinscher

* English Setter

* Eurasier

* Fila Brasileiro

* Flat-Coated Retriever

* German Shepherd

* Golden Retriever

* Gordon Setter

* Great Pyrenees

* Irish Setter

* Kai Ken

* Keeshond

* Korean Jindo

* Labrador Retriever

* Mastiff

* Mountain Cur

* Newfoundland

* Pomeranian

* Pug

* Rhodesian Ridgeback

* Rottweiler

* Shiba Inu

* Siberian Husky

* Tibetan Mastiff

* Thai Ridgeback