Have a friend with one or two big dogs come over and do a check around your house. When most of our fur kids were still with us, I had an elderly neighbor who called me often to bring Kurt and check out her yard. Neighborhood boys loved to torment her, so often with her permission, no, urging, I would leave Kurt there in her walled yard over night sometimes. I discovered that she would crack open the door and give him fresh meat from her fridge so he would like her. He used to LOVE going to her place!!! If he ever bit anyone, I never heard of it. By the way, Kurt was a large, mean looking Doberman who was quick to guard anyone he was told was a friend. He LOVED the old steak lady!!