I have a "big" problem. I have a male chihuahua that is neutred and then my boyfriends mother has a male chihuahua that is "not"neutred. And my chihuahua is not even two years old yet. Everytime that the two of them play together, my chihuahua ges on the back of him and tries to hump him. I've yelled at him and told him no but he doesn't listen to me. Now it's like that you have to watch him and the other one everytime that the two of play. I'm at my breaking point him because i don't want to keep the two of them apart so that they can't play with eachother. Can somebody please help out and give me some advice on what to do with my dog.