Welcome to the board. You mention "red zone" and getting bit yourself. Have they drawn blood on you and on each other? You have a few things going on here, and chances are it's not the dogs that's the problem. First, the younger dog is not protecting you from your older dog. It sounds like this younger dog has a rank issue, and is trying to lead your "pack". It is not uncommon for a strong 14 month old male to test his limits. Read everything on this forum about being a pack leader and NILF (nothing in life is free). Enforce your rank in your dogs eyes every day rigorously, be relentless and be a fair consistent leader. FYI, this does not involve "alpha rolling" or pinning your dogs on their sides. This could have easily contributed to your bite, fyi. Try to roll the wrong dog and he will come up leash. Here is a great article about the alpha roll... http://www.loucastle.com/dominance.htm
. Also, I would recommend keeping both dogs muzzled while around each other and you work on this. Individually get them used to the muzzle and make it as positive as possible. That way they can not hurt each other or you if they do get into it. Even with all of this, it could be possible that they will never get along, so be prepared to rotate them it things do not get better from your strong leadership.