Caesar has been doing so good with his aggression. But the past week or so he's been growling at night time again, especially at bed time. He just doesn't want to go into his excercise pen (that's where his bed, blanket, food, water and toys are). But if we leave him out when we're not home he eats things that he shouldn't. This morning he destroyed two DVDs. This afternoon Shane went to put Caesar in his pen before going to work and Caesar snapped! He bit him across four finger and even drew blood. I know that sometimes abused dogs will get aggressive but that isn't the case here. We don't hit him. On the contrary, he is very well loved! Why does he do this? Is it something we've done? Or haven't done?