Hi! I just adopted a puppy and he's the best little guy, so smart already! I know he's a mutt, but I don't know what kind! The only hint I have is the the speckled leg - looks like border collie. His coat is very soft. There is a thin layer of almost black hair on his back and tail, but not on the rest of his body. Can you look at the pictures and give me your opinion? Thanks!