If this is a full grown dog, I gotta agree with Skye that it looks like it's got some lab or similar mix in him. Only saying this based on the narrower body, narrower head, and longer muzzle. But I too am no expert by any means. I wish there was a definite way to tell a purebred from a mix. I'll have no way of knowing how pure my own pup is until he gets older.Just adopted 2 weeks ago, Is somebody here could verify whether he is a Pure Bred Rott???