I'm the devoted slave proud owner of three piggies. They're kept indoors as we're in an urban area (lots of cats and foxes, also foul weather) and pandered to accordingly.
EVERY SINGLE TIME I come in to the house with shopping they go crazy. It's the sound of plastic bags, which they associate with food.
I've started buying extra (extra, extra...) veg for them, just so I don't have to see the look on their little piggie faces.
Someone tell me to get a bloody grip!