I have not had to deal with this situation, but I have read alot about it. Maybe you should eliminate most of the things they fight about for a short period. Obviously not you, but when you give attention to them pet and love on your first dog, then go to the new one. Remie is feeling threatened that Roscoe is taking over. I would not have toys out with them both playing together for a while. I think it will be a slow transition but time should do wonders. Once Remie knows Roscoe isnt going anywhere and neither is he, they should work it out. Someone will be the Alpha usually its the first one, but not always. Sounds like they are still in the stage figuring this stuff out. I always crated my newest dog more in the beginning and didnt make any changes to our older ones routines for about a week and they gradually got along just fine. I am sure its harder with older dogs. They just need more time is my guess.
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