An abbatoir near me specialising in pork installed a state of the art pet food plant, and manufactured a dog food made from pork. They spent megamoney setting it up and conducting trials, and went into production. After only a few months they closed it down, because so many people were having to take their dogs to the vets with stomach problems and another problem was a build up of cholestorol which showed as fatty deposits in the eyes.
I think it was called Macmillans. Strange though, because we sell loads of pork related pet products such as pigs ears, snouts, dried skin rolls, trotters, even tails (although we can't get these now as they get sent to China where they are a delicacy).