Originally posted by Scooby4
To figure out if the dog is purebreed or not look at the roof of the dog's mouth or tongue. If it is solid pink then it is purebreed. IF there are black or patches of discoloration then it most likely is a mix.
I don't know the science behind it but that is what I have been told. I had a purebreed Chow who's entire mouth and tongue was dark Blue color. No pink.
I think your dog may have a "Lab" cousin a line back. My favorite dog I ever had was a Golden Retriever named Scruffy. She did not look like any Golden's I've seen. So Golden's can be different from eachother but still be Golden!
Sorry but I really do not believe this. Nebo has tons of spots on the roof of his mouth...brown spots on top of the pink. And he is a purebred dog.

I don't think there's any way to prove a dog is purebred other than finding out what dogs were bred before them and so on many years back.