A young dog is referred to as a "puppy." Puppies are typically defined as dogs that are still in their early developmental stages, usually under one year of age. They are known for their playful behavior, rapid growth, and need for socialization and training. During this time, puppies learn important skills and behaviors from their mother, littermates, and human caregivers. Puppies are often highly energetic and require regular exercise, mental stimulation, and positive reinforcement in training to help them develop into well-adjusted adult dogs.