Okay, so we found a male pitbull lab mix today and he has NOT been neutered. He is about a year old and enormous, but he is really sweet and goofy, but no manners. I have another dog, who is significantly smaller, she is a pitbull whippet mix, and a doll, but she has been in confrontations with other dogs but is spayed, she is 5 years old. Please help me on how to introduce them. They are different sex, and yes we are trying to find the dogs rightful owner.