Physical characteristics: Adult Rottweiler in size, with well-developed muscles, pure black fur color, with a small patch of light brown fur on the chest (shaped like an inverted triangle); deep brown eyes, with a fierce gaze, the corners of the mouth often slightly upturned, showing sharp teeth; ears are standing upright, with sharp tips, and a black leather collar is worn around the neck (the collar is adorned with metal rivets, exuding an aggressive aura).