A puppy or pup is a juvenile dog, generally less than one year of age. It has not reached sexual maturity. Puppy size varies among breeds: smaller puppies may weigh 1–3 lb (0.45–1.4 kg), while others are 15–20 lb (6.8–9.1 kg). All healthy puppies grow rapidly after birth. A puppy's coat color may change as the puppy matures, as is commonly seen in breeds such as the Yorkshire Terrier.
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