The Boxer is a medium to large, short-haired breed of dog, developed in Germany. In the United States and Canada as of 2012, cropped ears are still more common in show dogs, even though the practice of cosmetic cropping is currently opposed by the American Veterinary Medical Association. The tail of a boxer is typically docked before the cartilage is fully formed, between 3–5 days old. The procedure does not require any sutures when performed at this young age and anesthesia is not used. Boxers are friendly, lively companions that are popular as family dogs. Their suspicion of strangers, alertness, agility, and strength make them formidable guard dogs.