The curly tail was bred into them by Chinese breeders. The curly tail was an evolutionary answer to pig fights. During fights, pigs will often bite one another’s tail, causing serious injury. A curly tail is harder to grasp and bite.Click to see full answer. Just so, how do pigs get their tails curled?Another theory is that Chinese farmers liked curly tails and purposefully bred curly tails into their pigs. This could have also been because some pigs were then used in pig fights. Or, it could be a trait that was developed from wild hogs, a few of which have curly tails in China. why is my pigs tail straight? Wild boars have a straight tail, whilst pigs can have their tail in a curl. This is probably due to domestication. Not much is known of the function of the pig’s tail. It is suggested by Noonan (1994) that this tail posture indicates stress or pain. Subsequently, question is, what kind of pigs have curly tails? Hampshire Pigs The pigs on the list are popular as domesticated breeds and often have curly tails. However, for the popular pet breed of miniatures and potbellied pigs, most of them have straight tails.What does a pig’s tail do?The tail is full of neuro-anatomical structures responsible for the pain response. It is comparable to our human skin.” Unlike in many other animals, the pig’s tail may not have a wide range of functions. At best it serves to chase insects away and when in a curl, it gives an indication of the animal’s health.