Researchers estimate more than half of all cats owned in the U.S. are overweight or obese. Weight creeps on at a young age. By age one, roughly 15 percent of cats are overweight. By two, the proportion reaches 20 percent. One study found apartment dwelling cats were two times more likely to be overweight than cats that were free-roaming or live in larger homes. Mixed breed cats are more likely to be overweight than pedigreed animals. Neutering and eating a prescription diet are also associated with higher rates of overweight in cats.
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