Dan , glad you started this thread and agree wholeheartedly with the thoughts you expressed so eloquently. I would add one more area in which our dogs have educated us, and that is in helping us to be better parents. Having, living with, and training dogs before we were married and before we had kids helped Kathy and me to be better parents. Being consistent, meaning what you say but using positive reinforcement to get the behavior you want, recognizing the need for play, exercise, and stimulation, etc. -- these are all dog training/ownership skills that translate pretty effectively into raising good kids. Moreover, I think when our second came along it wasn't as much of a shock to our first, "only" child because she had had to share our attention with four four-legged "siblings" before her sisiter was born.
As Mark Twain once said, "I aspire to be the kind of man my dog thinks I am."
Best wishes,