What the color of dog?

Your question isn't terribly clear, but ...

A dog that appears white is often classified as 'grey'. And, oddly enough ... a dog that is truly grey is sometimes called 'blue'.

Dogs can be various colors, and this question is very vague and senseless.

Dogs can be black, brown, blue, grey, brindle, fawn, tri-colored, black, tan, spotted, speckled, splotched, striped, they can be a mixture of colors, three or more colors or one solid color. Some can be agouti, or merle or otherwise.

Look up dogs of various breed and find out which breeds have which color.

Depends on the Breed dog Breeds are many different colors .

Blue.