There are many breeds of pigs that stay small, including the pot-bellied, Juliana, and KuneKune breeds. The Guinea hog and the Mexican hairless pig also fall into the category of smaller breeds of pigs.
The size of these smaller pig breeds can vary. Teacup pot-bellied pigs can weigh around 40 pounds at maturity, while regular pot-bellied pigs average around 60 pounds when fully grown. Juliana pigs can weigh over 50 pounds when they are fully mature. A Mexican hairless pig can tip the scales up to 200 pounds when fully grown, which is still considered small for a mature pig.