The treadmill idea is horrible for carbon footprint, someone had a study up that riding a bicycle was worse than a small efficient car due to the low efficiencies in human food to work conversion. I'd think that you'd see a similar situation with a dog's food conversion.
I thought of rusticdog's location and pup collection so I stuck it up here, sent a copy to a friend with two big dogs and a SUV so he can feel guilty too.
