They're faithful, friendly and furry but under their harmless, fluffy exteriors, dogs and cats, the world's most popular house pets, use up more energy resources in a year than driving a car, a new book says.
In their book "Time to Eat the Dog: The Real Guide to Sustainable Living", New Zealand-based architects Robert and Brenda Vale say keeping a medium-sized dog has the same ecological impact as driving 10,000 km (6,213 miles) a year in a 4.6 liter Land Cruiser.
