Here's some of the stuff to avoid. And under that is what to feed them. 
AVOID ICEBURG LETTACE!!!!!!!!!!!!!
AVOID DAIRY PRODUCTS!!!!!!!!!!!!!!!
AVOID MEAT!!!!!!!!!!!!!!!!!
You can give them carrots (Only a baby carrot or a small piece of a carrot), Bell Peppers (Red, green or yellow), Romain Lettace, Apples (Actually that's a fruit), and Cucumbers. Too many baby carrots can cause liver cancer in Cavies. You can give them EACH a baby carrot EVERY OTHER DAY.
