He's right, pigs will chew on and destroy wood if they are bored. So don't have them bored and don't lock them in. They do not need heat. We are in the mountains of northern Vermont. It gets very cold and is very windy here. Probably even worse than Illinois. We keep our 400 pigs out on pasture. In the winter we provide them with open
shelters which they sometimes use and sometimes don't. Often they sleep out on
hay under the stars.
I do not recommend keeping pigs for pets. Do the math on the costs and manure produced. This can be greatly alleviated by keeping the pigs on pasture. See:
http://www.google.com/search?q=site:sugarmtnfarm.com+%22pet%20pigs%22
We do keep our pigs with sheep,
chickens, ducks and geese. The key is that during lambing time the ewes need a week or so to be away from the pigs so the lambs can get up and running.
Cheers,
-Walter Jeffries
Sugar Mountain Farm
Pastured Pigs, Sheep & Kids
in the mountains of Vermont
http://SugarMtnFarm.com/