O.k. not sure if this is typical behavoir for puppies or if my Duece is a tad bit aggressive. On a few ocassions while playing he has gone absolutely crazy. He starts biting very hard, growling, tearing around the room like he just took a hit of speed and is just absolutely uncontrolable to the point we have to put him in his crate to calm down. He gets plenty of exercise and it has only happened maybe 4 times since we got him 5 wks ago. I dont like putting him in his crate for bad behaviour but in this instance nothing else works.