I meant to ask did you have a hard time finding food your dog likes
Because of his skin allergies as a pup, I had him on venison and potato food, as any of the "cheaper" food made him break out like crazy. I'm guessing it was the filler or grain or whatever they use to be able to use less meat.
He grew out of it later in life and I had him on a number of other foods with Purina Beneful affecting him the least.
As to the question of what he liked...he never really liked any of them. I kept his bowl filled and he ate when he wanted, few bites here and there, but never scarfed food down like lots of dogs do.
My buddies bully will eat until she can't anymore...just one dog to the next.
He could not be eating because of being in a different environment, but that will change with time.
If you need him to eat, cook up some eggs and mix an egg in with his food, however if he is maintaining weight, just let him eat when he wants. Many bullys have to be watched very closely about weight, but you may not have one of those.
Man, I miss mine.