What colors are breed dogs?

Dogs can come in many colors, determined by their A, I, D, B, C, and E Locus.

I effects red intensity.

E effects red dilution, including recessive red (ee)

D effects Liver dilution

B effects Blue/black dilution

A effects tanning or recessive black (aa).

So technically, all dogs are some variant of red, white, liver(brown), blue, or black, with tan, merle, masks and white spotting adding even more variation.