I have a 9 almost 10 week old pitbull puppy. She's really a good dog, training really easy. But recently severely aggressive with my other dogs, and is now showing signs of food aggression and they all get fed in separate rooms. Now shes tearing the whole house to shreds, (has 7 toys with the option to go outside whenever), she can't be left alone with the other puppies (both 7 months old). She's getting to the point where if you make her sit and wait for a treat for longer than a good 5 seconds she'll start violently shaking and snapping at your face. I am correcting her with all this and rewarding all the good behavior but nothing seems to be helping, and she's getting worse everyday. I'm not sure what to do anymore, please help!