We need help. Have a German Shepard male 90 lbs. he is too protective. He bites. He's chased walkers and slow riders on the road. We live in country on five acres, with freedom to run. He minds my husband but only him. I'm worried what hell do when we are not here. My husband works outside and whether he's on the tractor or lawn mower Pete follows him everywhere. He has bitten some people and is food bowl protective. He was shy as a puppy so I fear he is a fear-biter. How do we get help from you. We love him so much. He gets along with my 9 lb shiztuh, but I think he would kill any other dog.