Known for their square-shaped heads and their playful, energetic temperaments, Boxers are a popular working dog breed. Developed in Germany, the Boxer is a cross between two now extinct breeds: the Old English Bulldog and the Bullensbeisser, a type of Mastiff.Scientific Name: Canis lupus familiarisCharacteristics: This Boxer is standing at attention in the classic Boxer pose, with its ears alert and its rear legs extended backward. It features the deep chest and strong neck associated with the breed.Size and Color: Boxers come in many color var