This is a strange situation with the female and male dog. They have been together his entire life and he is just over a year old. She is maybe 1 1/2 or 2. They had puppies. When she was having puppies I moved her inside because it was winter and I didn't want them to die. So after a few weeks, we moved them outside. I think he's jealous, but now that she is back outside, he attacks anytime they are near each other. Because of my elbow injury, I can't handle them on leashes and no one else has bothered to lift a finger to fix the issue. So to avoid problems, I just keep them apart. I'd love to be able to train him to tolerate her again because he is a super intelligent dog, but I just can't do it physically.