This ones easy.
Place a ad on Craigslist.
Free to good home, and be sure to list all of your wife's good qualities.
Ps Don't mention she's a tree hugger.
Let me know how this works for you. My wife hates dogs
There is time, and you must take it, to lay your hand on your dog's head as you walk past him lying on the floor or on his settle, time to talk with him, to remember with him, time to please him, time you can't buy back once he's gone" GBE