Puppy/ˈpʌpi/ Definition 1 of 3Pro Tip 1/3Age Specific Refers to young dogs, not adult ones. A puppy becomes a dog around one year old. After its first birthday, the puppy is considered an adult dog. Pro Tip 2/3Emotionally Charged 'Puppy' often elicits a warm, affectionate response and suggests innocence and playfulness. Seeing the puppies at the shelter made everyone smile. Pro Tip 3/3Offspring Number Dogs can have multiple puppies in one litter, differentiating from human single births. The mother dog had a litter of seven puppies.