Physorg: Thanks for killing the planet, dog owners. Well, that’s a rough paraphrase of a New Zealand study that claims a medium-size dog leaves a larger ecological footprint than an SUV. In “Time to Eat the Dog? The Real Guide to Sustainable Living,” authors Robert and Brenda Vale argue that resources required to feed a dog — including the amount of land needed to feed the animals that go into its food — give it about twice the eco-footprint of, say, building and fueling a Toyota Land …