A puppy is
a juvenile dog.
Some puppies can weigh 1–3 lb, while larger ones can weigh up to
15–23 lb. All healthy puppies grow quickly after birth. A puppy's coat
color may change as the puppy grows older, as is commonly seen in breeds such
as the Yorkshire terrier. In vernacular English, puppy refers
specifically to dogs while pup may often be used for other mammals
such as seals, giraffes, guinea
pigs, or even rats. Source
