Is Buddha in a crate when you're not home? Just wondering because if you're worried about Riley, I wouldn't let them together unsupervised until you know for sure his play style has become less aggressive.

I've seen puppies as young as 7 weeks acting in extremely dominant and/or aggressive ways. In some cases, the puppy had to be put down BUT that was because of aggression towards people.

What kind of dog is Riley?

I think it would be wise to stay in classes as long as possible. It may even be good for him to play with a dog who will correct him when he acts tough... put him in his place. I might also have a session with a behaviorist. The behviorist can evaluate your situation and tell you what to do.

I am sorry you're going through this and I wish you the best of luck in correcting the problem.