Rhodesian ridgeback mix

Commando was called an australian shepherd mix at the shelter. I just found that impossible to believe because his coat is short and he just looks nothing like a shepherd. I've been searching pictures of dog breeds and I think he looks the most like this dog, a Rhodesian ridgeback mix named Gracie. I'm not sure why I bothered with this search, but it's just interesting I guess. Except for the color, these two dogs could be twins.