Flat-Coated Retriever (often called the Peter Pan of dogs) and other retriever breeds were developed in the mid-19th century. They are very cheerful, easy to train, and eager to please. They are very energetic and love to retrieve things especially from water; they require lots of daily exercise. They make a wonderful family dog. This breed is a great choice for families with young children because they are friendly and extremely sociable with anyone. They love to be in the middle of attention. The average height of the Flat-Coated Retriever is 23 to 25 inches, and the weight ranges from 60 to 80 pounds.