The pot-bellied pig is a breed of domesticated pig originating in Vietnam. Pot-bellied pigs can be easily discerned from other pig breeds by their size, upright ears, and straight tail. Not all pure sub-species have a pot belly and a swayed back. Considerably smaller than standard American or European farm pigs, most adult pot-bellied pigs are about the size of a medium or large-breed dog, though their bodies are denser at 20 to 300 lb. Because pot-bellied pigs are the same species as ordinary farmyard pigs and wild boars, they are capable of interbreeding. Most pot-bellied pigs have been crossed with various farm pig species, which is why many are outsized in comparison to a true purebred Vietnamese Pot-bellied Pig. Today, the Vietnamese and German governments have realized that the indigenous Vietnamese pig sub-species exist only in mountainous Vietnam and Thailand. The recent upsurge in the popularity of pot-bellied pigs as pets has led to abandonment when owners discover that the pigs actually grow to larger sizes and require more care than they believed. Others are forced to give up pet pigs due to local ordinances.