Rottie, Perry and Daisy vacation with Rocky and Sunny with our families, so they are together a lot. Believe me, they are the only dogs they get along with. When we get together there is about five minutes when Perry has to show Rocky he is alpha male and puts him down on the ground, then Daisy feels the need to be alpha female with Sunny, after that five minutes everybody plays together and they get along fine.
Thank goodness.