I'm part of a Pit Bull forum and everyone there uses prong collars, so that's why I've been using one on Brennan. I've been told that harnesses aren't recommended because they make the dog pull more, and gentle leaders also aren't recommended because if the dog is a really bad puller (which Brennan is), then they can cause a lot of neck damage. That's the only reason I went with the prong.

I've been looking into obedience classes, but don't think we'll be able to do one right now. The one I wanted to join was scheduled during one of my evening classes, and as busy as I've been lately, I've just been trying to work with him myself.

Thank you everyone for the tips though, they're very much appreciated.

Brennan was okay at the vets, he didn't get as excited as usual and I was able to distract him with some food.