The moment the last of the squash and potatoes were in, dad and I strung 2 lines of electric wire around our garden (and tripled its size). I was apprehensive to leave them without a physical barrier, but we've had no problems.
I built them a small house out of bales, and we hope to keep them there till spring. I've begun to throw manure/compost into the garden. The pigs spread it; leaving no traces. When spring comes, and I clean out the barn, all that will be spread by my (then large) volunteers. I hope, they will be harvesting size just about the time we need to plant the garden in April.