Forages such as grass or grass hay should be available to pet pigs at all times. Eating grass and hay promotes healthy digestion in pigs, from helping to wear their teeth down properly to preventing gastric ulcers. Bermuda hay and Timothy hay are healthy choices for potbellied pigs. Alfalfa hay is too rich in calories for most pet pigs. If your pig has never eaten hay before, you can encourage consumption by wetting hay with a small amount of apple juice or other fruit juice. Discard any wet, uneaten hay daily to prevent molding.