My sister and her family have a white boxer. He constantly jumps on me when I come to visit. He wants to play tug with many of his toys and he always wins. He is stronger than me as I have asthma. I can win if I do it quickly, but he wants to paly over & over. If I stop and don’t pay attention to him, he will growl and won’t stop growling & barking. He’s demanding that I play with him. If I tell him no, he doesn’t stop. If I get up and move towards him, he runs away barking & comes back when I turn my back or attention away from him to start all over again. I’ve tol my sister, mother, and nephews that they need to train him and that this behavior is dangerous. They just don’t get it. I must go there to visit my mother who is 84 years old and I worry about her. What should I do?