In the past couple weeks, my mare has begun eating the straw in her stall. As in-all of it. You'll go out in the morning and there will be not a speck of straw left in her stall. I've started giving her more hay at night to hopefully get her full enough so she won't eat it, but this horse will eat anything you put in front of her. There's also a big round straw bale right outside her stall that she's constantly munching off of unless she has something better (I put a sheet of plywood up so most of it's blocked, but she can still get at it).
So far there have been no health impacts, and she's a pretty robust little horse who is generally pretty healthy, but I'm wondering if there's anything I should be concerned about with her eating that much straw. None of the other horses eat it. She's never colicked (sp?) before, and I'd hate for this to be the thing that causes her to.