I'm Dun
Well-Known Member
Having seen my horse stomp on a treat ball when the nuts didn't come out fast enough I would guess this is what's happened to this. It's a crack in the plastic not a hole where the teeth are stuck.
My super heavy cob cob has tried to stamp on his when he had one with tiny holes and it didn't damage it, really slamming his foot down on it with serious intent, so there's got to be something else going on.