It was the same way with my horses! Cocoa was top mare cause she was here first! Zoey came next, but she was so young(8 months) that when Alkris an older mare came she took second, which left Zoey at third. They knew their order, and we never had any problems. I was top mare, but they still had their own order. It is nature. It si what keeps them happy. Without order there is chaos!