Answers. Best Answer: It really depends on the breed and how much you feed them. Regular dairy goats can range from 100lbs to 200lbs! The structure of a goat really determines the weight. The sire/dam (parents) have a roll in the size. Also, if you breed a dairy goat as a yearling, the goat will generally stay smaller than if you breed them at age 2. Height wise, a normal dairy goat can be measured (at the minimum) starting at the withers, 30 inches (76 cm) for does and 35 inches (88 cm) for bucks.