Why do you want them to play together so bad? It's really not worth it. AB's aren't known for being "dog friendly" and this will become even more apparent as Nelson gets older. If you keep insisiting on putting him into these types of situations with other dogs one day he will be in a fight and you will regret it and once a dog gets into their first fight good luck trying to break them from it as many times it becomes a bad habit. Not to mention the vet bills. Nelson can have plenty of fun playing with you. YOU can be a better friend to Nelson that any other dog can be. If you want a dog that can safely romp with your family members dogs you should have got a Lab.