Maybe my Henry gets a buddy- how is everyone introducing dogs to each other?

Not only can it work, you can make it work.
My Georgie was in the shelter because he and his Mum were chicken killers. When I got him, he went after any small creature that crossed his path. I caught him hunting and killing gophers one day. Not acceptable. I put a stop to it by claiming them. And claiming every other creature he went after. If you are the Alpha, whatever you claim is off-limits.
Georgie now watches the gophers play, allows any cats so inclined to approach him, and shows absolutely no interest in chickens or birds of any kind.
You
can make it happen.