I have an 11 year old yellow lab named Sammi. She refuses to walk with me. My parents and other siblings have no trouble whatsoever when walking with her. When I try, Sammi will just stand there and not move or will sit down. Even my friends who have never walked her have no trouble. It's only me that she won't walk with. I was just wondering why this happens? Why just me? What could I have done? And what could I do differently?