Marnalou,
I know you and George are going through one trying time and my heart goes out to you. I wish there was some advice or a person I could direct you to, but unfortunately I am helpless here.

Stewie is such a big strong dog, that your alternatives are limited. I know you don't want to hear it, but he's so powerful and lively that maybe a farm is the solution for Stewie's soul. He'd have plenty of room and could run around to his heart's content. He comes from a working breed, and maybe that's what he needs. I don't know, but this is all that I can come up with that might help you guys.

I am so very sorry
Marty