Peso, an adorable-but-chubby chihuahua, takes a nap in his dog bed. Like many toy breeds that are especially susceptible to obesity, Peso put on a few extra pounds after being neutered.
Because of changes in behavior and metabolism following castration, it's important for pet owners to monitor food intake and to provide ample opportunities for exercise.
One of every four dogs and cats in the Western world is overweight, according to the National Academies' National Research Council. In the United States, it's a troubling trend that mirrors a human obesity problem.