I don't have pot bellied pigs but I have mini goats (Nigerian dwarf and pygmy goats) and I have loads of chickens, as well as some sheep. I have three female llamas and they get along wonderfully with all the animals. When I got 2 of them, they had only ever been with horses and donkeys. The 3rd one had been with sheep. She is a proven flock guardian and had killed a fox that got into the sheep pen at her previous home. We love the way they keep an eye on things and they are very gentle with the mini goats. Thus, I would not anticipate a problem, but one can never know for sure. Any chance you could take the llama for a "test run" at your farm and see how things go? Responsible sellers would hopefully be willing to do that, in order to find the best home for their animal(s) and to be respectful of yours.