Pigs and dogs do not mix. If you have raised a dog for years then bring a pig in or vice versa extreme measures should be taken to protect both animals. Dog owners will tell you not their dog he is sweet and the pigs best friend and in a blink of an eye days, weeks or years down the road it happens. ” I only turned away for a split second” the owner says. That is all it takes is a second. Most of the time the pig will start it and the dog finishes it leaving pig severely injured or dead. DO NOT ever leave them alone unattended in same area alone and unsupervised. Even though you feel they are bonded with no issues. Instincts are instincts just takes a split second even right in front of you it can turn deadly. Dogs are predators and pigs are prey. This is at the very core of their DNA. Normal pig behaviors (running away, charging, biting, challenging) and sounds (squealing, screaming) from a pig can trigger the dog to attack. Pigs go through many changes in temperament as they age and especially the ones which have not been fixed/spayed. Pigs go through many stages as they age: Infant stage, toddler stages, teen stages, adult stages, elder where the pig may no longer want another animal/dog near. Pigs can kill/injure small dogs, puppies also if they dont want animal near bothering them. They have also been known to kill chickens, ducks when agigtated also