According to the Association for Pet Obesity Prevention, more than half of cats and dogs in the U.S. are overweight, and that number keeps increasing. "The real analogy we emphasize is childhood obesity," said veterinarian Ernie Ward, founder of the association. "For pets and children, obesity is a problem by proxy; they don't make their own choices." Pet gyms, exercise services and devices are cropping up to help owners get their pets much-needed exercise, but Dr. Ward points out that owners don't have to spend a lot of money to help their pets slim down.

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