Here are some more, so you can get a really good idea. He weighs 91 lbs and is extremely friendly and funny, and loves to run (thinks he's a greyhound)! He can jump very high (see the photo with him jumping into the truck - he did that from a sit!). That's why I'm thinking maybe he's not part rottweiler. Somebody said Rottweilers aren't jumpers.

Any ideas? Not that it matters but it's fun to guess.