Smokey is a 4 year old Netherland dwarf and is absolutely lovely he loves cuddles and is so friendly, yesterday I got a new bunny a black and Caramel Netherland dwarf, I let him settle in, overnight, and they had a 10 min play date this morning and smokey would just hump him, I know it's for dominance, but it is irritating as my new one might get hurt, how can I stop this??