Appearance characteristics: the coat color is black on the back, grass yellow on the abdomen, big head, wide face, short nose, short and thick mouth tube, large distance between ears, obvious butterfly spots on the face, dark brown eyes, short neck, large abdominal circumference, developed limbs and strong body.

Police characteristics: strong excitement, fierce temperament, active and aggressive, and good vigilance, alertness and biting.

Wolf black strain

Appearance characteristics: the coat color is wolf blue, the head is small, the face is small, the nose is long, the snout is slender, the distance between the ears is small, and the eyeball is dark brown. The neck is long, the abdomen is small, the muscles are strong, and the tail is slightly longer and straighter.

Police characteristics: calm and lively, strong attachment, easy to balance excitement and inhibition, good performance in identifying, tracking and biting, comprehensive working ability and wide use.

Rice straw yellow strain

Appearance characteristics: the hair color is grass yellow, the head, neck and abdomen circumference are between wolf blue strain and black-backed strain, the nose is full, the limbs are handsome, the body shape is slightly smaller than the other two strains, and the eyeball is apricot yellow. Easy to roll back.

Police characteristics: lasting excitement, strong athletic ability and strong tracking ability.