http://www.cnn.com/2011/LIVING/03/26/do ... index.html
Bottom line: Our pooches cost the Earth more than a Toyota Land Cruiser. According to the Vales' research, a medium-sized dog has twice the impact of driving the luxury SUV 10,000 miles. Why? "Basically dogs are bad for the environment because they are large carnivores, so it takes a lot of land to provide their foods," says Robert Vale.