I think I may be over reacting but I guess it never hurts to ask. Saturday we took our 12 week old Australian cattle dog, Murray to a friends place. There were three other dogs there who we know quite well. Everyone was getting along just great until Murray found a toy. He stood over it barking and snapping at the other dogs whenever they came near him. He does bark a lot when he plays but this time he had some real attitude. I took the toy away, he has no problem with people taking things from him but it seems like he might have an issue sharing with other dogs. Any suggestions as to how I can correct this now before it gets out of hand? Or am I just over reacting?