I noticed that with Klausse and Wolfgang, my two rat brothers, that Wolfgang, the smaller agouti, seemed to always be the dominant one, more outgoing and aggressive but every so often, when he got a bit too big for his britches, his brother Klausse, the bigger, more gentle Russian Blue, would turn around and "give him the business", like a quick slap or nip, as if he was saying, "Look buddy, I am easygoing, but you're pushing my patience so KNOCK IT OFF" and Wolfgang would immediately back away and be a good boy. Ha!
