This morning was the first time that our new puppy has gotten into a fight. She is normally very submissive, but lately she has been very possessive over toys, treats, etc. Our second dog is starting to do the same thing and its getting frustrating. This morning I gave them each a toy, and five seconds later Athena, our puppy, lunges at Milo, our oldest, to steal the toy, and immediately starts a full out fight. I break them apart and Milo runs into his kennel and before I get a chance to grab her, she follows him in there and starts it again! I finally got them completely separated, and today she is in "solitary confinement", separated from the other two. I'm just very frustrated by her behavior, and immediately told her "no", took the toy and separated them, but I don't know what else I can do to correct this behavior. I can't always keep them separated and away from toys. The real problem is just her possessive behavior. Like I said, she's normally very sweet, so I don't know if this is just a puppy thing or if it's her true personality starting to come out. Please help!