Ruthie's breeder suggested marrow bones (the ones you buy at the grocery store for soup and stuff) - they eat all the crap out of them and then chew on the bone.. because the bone is raw, it won't splinter and be dangerous for them to chew on. They can't really eat it, they just chew it. Ruthie and Oscar LOVE their pigs tails they were recommended by Oscar's breeder. They are called Texas Toothpicks and they have absolutely NO smell - here's a link of what they look like:
http://www.renspets.com/mm5/merchant...egory_Code=CHW