Button Bucks will fight. I have seen them fight, plus make rubs and scrapes. Recently killed one that had small antlers on his head. After I shot him I was looking at the lil antlers and they detached from the head and fell into my palm. It all depends on how early they were born and how much time they have to develope before the rut. I am not 100% sure if they are able to breed, but I have seen them try.