my dog has black spots on his tongue that appears to be growing what can be the cause of it?

Answers:
There are many other breeds that have black on the tongue besides a Chow

Other breeds that can have black or purple on their tongues include :

Shar-Pei, Labrador Retriever, Golden Retriever, Cocker Spaniel, Siberian Husky, Rottweiler, Rhodesian Ridgeback, Newfoundland, Collie, German Shepherd, Akita, Belgian Sheepdog, Tervuren, Malinois, Fila Brasileiro, Cairn Terrier, Great Pyrenees, Keeshond, Airedale, Doberman Pinscher,
Bouvier de Flandres, Australian Shepherd, Australian Cattle Dog, Pug, Shiba Inu, Dalmatian, Flat-coated Retriever, Gordon Setters

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I've had several mix-breed dogs in my life that the Vet's say means, they have some Chow in there somewhere, don't know if that's true or not, but.

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Your dog is probably part Chow. They're known for having black on their tongue. Don't worry about it, several of my dogs have had this and it wasn't bad.

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Agreed, the dog is probably part Chow. My dog has some black on her tongue and the vet said that means she's part Chow. It's nothing to worry about.

Now, if it's oozing stuff, well that's different but if it just looks like it's part black then it's no big deal.

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my belgium shepard had one too. some breeds can get them. thats all. its no big deal. my ausy shep has a really little one. i think its like humans who have geographical tongues. i have one of them. its really weird and there isnt much that can be done about it, and there is no reason behind it, it just happens.

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I have a Golden Retriever that has two black spots on her tongue.