I picked up a new foster pup on Saturday. The people that had her told me she is approximately 9 weeks old. Mom was a Rottie/Shepherd mix, that I met, very friendly and well behaved dog. They said they had no clue what dad was. I'm guessing Lab just cause she's black, fuzzy and there are lots of Labs around here, LOL. Anyway, she is showing some alarming behaviors for such a young puppy. She gets along with the other dogs, but she will attack any of them if they come near food, toys, blankets, or where she *thinks* something was (like where I fed her, even though the bowl has been put away for 2 hours). This is not playful puppy growling, this is a full on attack. When I attempted to separate them, she turned on me. I've been bitten by her twice, hard enough to break the skin and bruise my leg through my pants. I can stick my hand in her food bowl with no problems. And she shows no aggression towards people (other than the re-directed aggression when I am separating her). She is otherwise a healthy, happy, playful puppy that does play nicely with the other dogs when there isn't something she wants. I've NEVER seen aggression in a puppy this young. Any suggestions?