For awhile now we have only had a mare (Dora) and a gelding (Kid). You would think that the Kid was the boss...he always comes in the gate first, drinks water first, eats first, etc. I've come to realize it's only because Dora allows it, not because he's over her. We recently got another gelding and the fact that she was boss really came out when introducing him to "the herd". Kid sort of hung back and let her handle business and he only put in his two cents if the opportunity arose. The three of them still haven't come together into a friendly relationship yet, but you can definitely see that the mare calls the shots. I love watching. If the two decide to go to another area in the pasture and the newbie doesn't come, Dora nickers to him. If he still won't come she makes him. Kid does nothing at all, practically ignores him really.