1. Dog: It belongs to Chordata, Vertebrate, Mammalia, Orthoptera, Carnivora, Schipoda and Canidae. Dogs, also called dogs in Chinese, are distributed all over the world. Dogs, horses, cattle, sheep, pigs and chickens are also called six animals;

2. Wolf: a national second-class protected animal, subspecies ***46, with medium size, well-proportioned limbs and flexible toes, which is conducive to fast running. The head and palate are sharp, the face is long, the nose is prominent, the ears are sharp and upright, the sense of smell is sensitive and the hearing is developed. Canine teeth and cracked teeth are developed, and the hair is thick and long;

3. Cat: It belongs to the feline family, which is divided into domestic cats and wild cats. It is a pet widely used by families all over the world. The ancestor of the domestic cat speculated that it was a desert cat, Persian cat, which originated in ancient Egypt and was domesticated by human beings for 3500 years.

4. Horses: Horses are herbivores and were tamed by humans 4000 years ago. It can cross and have offspring. In ancient times, horses were the main driving force of agricultural production, transportation and military activities.

5, pigs: vertebrates, mammals, livestock, ancient omnivorous mammals. It is divided into domestic pigs and wild boars. Different breeds have different physical characteristics. Usually manifested as big ears, long head, straight nose and narrow waist and back.