Loki beats up on the dobermans at daycare so I will have to deal with this issue should we ever get a second dog. I don't think you should let Eddie be the Alpha. You are giving him too much power. If he fights like that, you need to ignore him or put him in his crate. Fighting = no freedom. Eddie is in training right - have you talked to the trainer? Also, is it a positive trainer? I know you've mentioned "correcting" Eddie before and generally positive trainers do not do this. It's best to use a positive trainer for agressive dogs just because other methods can (not always but can) make the problem worse. Reward Eddie when he is kind. Teach him good things (food/attention) happen when Jack is around. Beyond that, I'm at a loss because like I said - I have a bully too. Can you try petting Jack while someone holds Eddie or has him on a leash and praises/treats him for being kind? Teach him he gets treats when Jack gets attention?
Loki gets mad when I pet the neighbor dog, even though he is Loki's best doggy friend. So I go pet the other dog while my husband re-focuses Loki and gives him treats. Also I feed Loki with one hand while I pet the neighbor dog with the other hand. Slowly he is learning to be more polite.
But again, this sounds like you need a professional.
