Yes, what I did was a very, very "ify" gamble that paid off, but I was done being afraid of him and what he would or would not do. I was done w/his playing controlling games. MLCers do not like to lose, but my xh knew that I was not playing and he knew that his soul mate's name would come out along w/the photos that my PI had taken. I took back control of my situation in the nick of time. This strategy may or may not work in Pax's case, but it provides an example of what she may use, but in her own way/situation. Do not be afraid of him or his tactics. He's the one that is out there acting like a putz and being a selfish one at that. You have done nothing wrong but show compassion and attempting to work w/him on everything.
Pax, your h isn't going to give that dog up w/o a fight. In fact, if you were to put something out there about another dog, he would definitely suggest that you get it for yourself and not the other way around. As for finding him another dog just so that you can have your fur baby back...that's not going to work. Again, he would say you need to keep the replacement for yourself. He is a selfish, spoiled little brat in the sandbox.
MLCers are selfish people, i.e., just like that little tot in the sandbox that wants all the toys that another little one is playing with. When that selfish tot sees that the other little one has moved on to something else, that is when the selfish one will give up all of those toys he/she has taken. What I'm suggesting is that when you cease showing that you want your fur baby, i.e., showing that you just don't care any longer, maybe that is when he will decide the game is up and lose interest in keeping the dog for himself.
You know your h better than anyone. You know what he is capable of, especially at the present time. This situation is one that you need to sit and think about. Try to remember, you have nothing to fear but fear itself and of course, nothing ventured, nothing gained.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.