My little friend gets very angry (growling,snapping,etc) anytime I get close to him when he has certain chew toys. (denta-bones, pigs ears, zipper of my sweatshirt, etc) There are some toys that you can take,give,throw, etc with him and he doesn't react that way at all. The only way I have been able to get the toys from him is by trading him for a treat. Any suggestions on how to train him to NOT turn into the tazmanian devil when I get too close??