My 6 year old rescue dog Tundra, growls at my handicapped brother when ever he walks near me! If I’m not in the room he’s playful and loving toward my brother! I’ve tried everything thing to stop this negative behavior!!! Tundra has even snapped at him! We rescued Tundra 9/5/2015. Other than that he’s a wonderful dog!
Have you tried walking into the room with your brother? What about sitting by your brother or hugging him and then someone letting the dog in the room to see you with your brother?