Dogs love to protect their toys, and they love to play the guard game. You need to train your dog the “give it” command (I do too). This is when the dog will bring a toy to you and give it to you rather than wanting to wrestle or have you chase them. They love to play chase too. Have treats handy and say the “give it” command. When the dog gives up the toy, show it the treat, pick up the toy, then give the dog the treat along with praise. Then give it the toy back. After all, it is the dog’s toy. Remember the key rule, no negative reinforcement, no yelling, hitting, scolding.