Shadow is now 7 months old and I still don't know all his breeds. I know i never will know for sure but i would appreciate some opinions. Humane society called him a border collie mix. I am guessing he is part border collie (the markings), part australian shepherd (the nub for a tail). The third breed however i do not have any idea. His coat does not resemble a border collie or an aussie. I first thought lab but now his coat is too long for lab. a friend of the family says she sees german shepherd in him. i thought maybe blue heeler. any opinions?