I hate to break it to you, but your dog's one of Them. You've been under his subtle control for years. Think about it - which one of you gets up, heads over to the can opener, and feeds the other one?
Don't feel bad. They have a lot of us fooled that way. And don't even start me about cats.
I came to that same realization a couple of years ago. I had a day off and spent it running errands for my pets while they rode around in the back seat. My dogs will come up to me and start barking and I'll let them out. They bark again and I let them in and give them a bone. It took them a couple of years, but I'm trained now.