New iPhone app helps keep pets trim

Tipping the scales at 97 pounds, Sam was a chubby black Labrador retriever. Partial to meat, potatoes and the occasional mouthful of popcorn, he was a fine dinner companion and not very old when walking became difficult because of excessive weight. Today, Sam is a trim 85 pounds, much closer to the recommended weight range for his breed. His owner did it the old-fashioned way -- guessing what might be the right amount of food to feed for healthy weight loss.

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