They call them fawn colored... It has something to do with breeding a liver and blue sable and something about blocking out certain colors like mainly the black and the liver so it just turns out all tan. But that's just what I read about. I mean he might be sable but maybe not. It's pretty exciting to find out though, I kinda want him to stay this color cause it's so unique, ya know? When he was really little though he had that same color it's just mine seems more reddish tan then your did... Btw, your puppy's so cute!