I think thats the best idea! Just give it a "trial run" for a weekend and he will see that one more to the family isnt that much more work! As long as you have the time, love, finances, and patience for her, I don't see why he would refuse. And if shes already trained, thats defianlty a plus. Just make sure you compromise and set aside "alone time" together. He'll be a happy camper. She'll be a daddy's girl in no time!