The pig zodiac sign is a vertebrate, a mammal, a domestic animal, and an ancient omnivorous mammal. Divided into domestic pigs and wild boars. It is generally believed that pig is the abbreviation of Suidae. Pigs have different physical characteristics depending on the breed. But the Pig zodiac sign is a spendthrift and a drunkard. The Pig is a vertebrate, a mammal, a domestic animal, and an ancient omnivorous mammal. Divided into domestic pigs and wild boars. It is generally believed that pig is the abbreviation of Suidae. Pigs have different physical characteristics depending on the breed. But the main physical characteristics are usually big ears, long head, straight nose, and narrow waist and back.