I agree with what everyone has said. And most importantly (and TRUTHFULLY) tell her that you believe it is in both pups' best interest (and of course your own

) to keep him and buy her a new one. Honestly, if she only had him for a month, and you've had him for 3, I think it's harsh of her to not let him stay with you, but if she says she wants him back, I'm not sure there's a lot you can do. Good luck, and be sure to keep us posted! Just be friendly and talk it out