Trust

As much as I sometimes think that dogs lead great lives of sleeping, eating, and playing almost all the time, I realize that I wouldn't be happy with the amount of trust that you have to put in other people as a dog, or as any type of pet. Dogs rely on people for their food, although they can apparently learn to fend for themselves on the streets (but still, they're probably most eating people-food still), to be let outside (would you willing lock yourself in a building where you were completely unable to open up the doors or windows?), and just in general (how many people do you know who consistently come when called?).

So yeah, I think it would be fun to sleep half the day and go run through the brush after squirrels and rabbits the other half, but I really think I'd have issues with not being able to do anything for myself.