Welcome to PT, Bentley and parent!

I think that once Bentley gets fixed, he'll calm down some. What about positive rienforcement? When he doesn't act agressive, give him treats. Being sure NOT to reward the negative behavior when he is agressive. I have cats, but know that when you reward negative behavior - even if it makes them stop growling or biting for 30 seconds, it reinforces a bad behavior.

I would find a way to STOP this behavior, not reward it with treats. If he is doing this at a hospital. Maybe he shouldn't get to go to a hospital - where he is essentially being rewarded for his naw-tee behavior.

Luckily, he's a pup and will probably catch on real quickly.

Good luck!