Hi, we have a totally gorgeous puppy and a friend of ours has adopted her brother. He comes for regular visits and they are so excited and happy to see each other but it often always descends into really rough play, it sounds horrible, no one has been actually hurt but there is a lot of ear/cheek pulling etc and when it gets too rough I have been on the receiving end of a nip when trying to separate them. I now use a water pistol instead but I guess what I'm asking is, is this an age thing? Will they grow out of it, we'd love to eventually be able to hang out and go on walks together without it descending into a gypsy camp style dog-fight. Does anyone have any tips or advice? Many thank s