Originally Posted by MythRider
Cribbing is chewing on wood. Have you ever seen those chewing collars? Those prevent horses from chewing on wood because horses can mess up property (ie fences, stalls etc). It means that horses chew/bite on wood...
Cribbing and wind sucking are basically the same thing. Wood chewing is totally different. Wood chewing is often associated with some kind of diet defiency....some horses will eat the bark off of a tree if they have nothing else to eat. But generally it as seen as a destructive behavior. Cribbing/windsucking is when the horse grips on to something solid (fence/stall door....my TB does it to his cement partition in his stall) with its top teeth, pulls back and grunts/sucks air/etc. There are lots of different causes to this, but mostly it can be treated with more excercise. A good way to determine if its cribbing or wood chewing is to look out at your fences. Do you find pieces of splintered wood on the ground, or have they magically disappeared?
I would say that this could be a boredom habit. Some horses are naturally more mouthy, as in the like to test things with their mouth. But if she's biting, it also can be a dominance issue. Start correcting her immediately.