Their ferocity is at a much higher level than that of a sport dog, even the most intense sport dog. The sport dog is basically playing a game that was built with a high level of prey drive, coupled with defense drive to build fight drive, and in some circles, prevent flight or avoidance. The sport dog can get all jacked up and upon release can be given his 'ball' and all is well in the world. The Fila must be physically removed from the area in order to 'wind down' and it takes time. Actually very similar to the bulldog who is rolled or matched for 30-40-50 minutes and is still mad and geeked up 30 minutes afterwards on the ride home. EWO