Just got a 1 year 8 month pit bull from the humane society named Capone. We already had a 8-9 month old pup that is most likely a German pincher or a mix with German pincher named Dag. Capone is 60 pounds and Dag is around 45 pounds. At the humane society they both got along. When I brought them home all they do is play fight, some light biting and jumping, and a few barks and growling from both. I'm sure everything is O.K. but is it normal for the play fighting to last all day? I don't want it to escalate.