Labrador Retrievers are the lovable, family-friendly dog we all know and love! Labs have been the most popular breed in the United States for 25 years running. One of the older recognized breeds, Labradors were originally bred to be strong, active retrieving dogs that excelled in hunting and swimming. Today, they are known for their outgoing and energetic personalities, and are extremely intelligent and devoted pets. These pups have a high energy level and therefore require a significant amount of exercise. Labs are an incredibly versatile breed, as they can excel at anything from K9 police work to agility to service work for the disabled. Full grown labs are medium sized, typically weighing in at about 55-75 lbs.