Knowing that you would be placed with a loving & responsible family, would you choose to live 7 - 13 years as a dog? Or a 50 - 70 year old human with no guarantees? (Heh, well aside from the 50 - 70 yr. old one...)

I look at my Great Dane, Zelda, who is only 9 mos. at the moment, and think of how good she has it. She has no idea that her life expectancy is approximately 7 - 9 years (nor would you or I if we took the question's first option), but is that really something to concern yourself with when you're waited on hand & foot, void of any responsibly, and can nap for 12 hours a day YOUR WHOLE LIFE.

To be clear, I do have plenty more brain busting questions than this, its just that most of the complexity involved in discussing them seem ill-suited for the medium of the Internet.

Cheers