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Tired of cleaning up hairballs? Add some fiber to your cat's diet.

An ideal weight for most cats is 8 to 12 pounds. Even the larger breeds of cat rarely exceed 15 pounds, with the exception of a few relatively rare breeds.

Some breeds of cat routinely weigh a few pounds more, though, without an ounce of fat on them. Among the heaviest breeds are Norwegian forest cats, Maine coon cats, rag dolls, Siberians and Turkish vans. In these breeds, the largest males routinely approach or top the 20-pound mark.

The Singapura is the smallest breed of cat, with females as tiny as 4 pounds. The Cornish rex, Devon rex and Japanese bobtail are also feline featherweights, weighing in at about 6 to 9 pounds.

Fat is unhealthy for cats, but crash diets can be deadly. Talk to your veterinarian about your cat's proper weight and how to attain it.