It's usually better to only keep a pup on a puppy formula until they are neutered. Neutering causes metabolic changes that can cause a dog to become pudgy if they are left on a high protein, high fat puppy formula. If you have your pup neutered at six months, it is just fine to switch him to an adult formula at that point.
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Penny: Bane of Moles! Terror Among Terriers! Really Gosh Darn Cute!
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