[lynn's Cavies]

My shorthair female, Edna, does this from time to time with my sheltie, Bette, and I found it was happening more when I hadn't put enough hay in the cage to last until morning. Now that I really stock that hay up (cause they should have hay 24/7) it isn't happening as much. Edna is definitley the more dominant pig. I heard it can also be from boredom.