Taking them on walk together might help too. I have a fear aggressive dog (when it comes to other dogs) and a not-so-dog-tolorent aggressive dog, and when I brought Chloe into the mix they weren't too pleased. They didn't hate her, which shocked me, and were actually very tolorant of her, but I think the best thing that got all three of them used to each other was me walking them together. They weren't allowed to interact on the walks except for some harmless sniffing. After a couple of walks, I was able to let Blackie and Rose off leash around Chloe (with Chloe still being on leash because she's worse than either of the other two) and they now get along fine (with me to supervise and Chloe on leash).
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