Vet told me that under no circumstances should cats/dogs ever have pork. Not good for them at all.
My Jack Russells both love cooked bacon but they get it in moderation. I don't get mine from the grocery store though. I get it from a slaughter house store and it never has preservatives or anything in it. It's not even refrigerated. It just hangs on hooks in the open. We get it sliced and buy about 50lbs at a time. When I get it home I split it up into 1 gallon freezer bags and put it in the freezer. None of our meat comes from the grocery store. We keep a home grown calf in the freezer all year.
They never get sausage because of the herbs and they hate raw bacon. I'm sure it's not good if they eat much though so for them it's just a small occasional treat.