no cribbing collar works for my guy. He cribs right thru it. if you keep tightening it, it can become too tight. a boarder thought my horse needed the collar to be tighter. I was not there. I get to the barn and my horse is nearly passing out, and in distress. I took the darn thing off and got rid of it. I hate collars. they are annoying for the horse and can cause rubs, which really hurt. If your horse can wear one and you don't have it too tight, then that is great. however, not all horses can use them.
That is when we decided to hotwire the top of the fenceline. i bought a solar charger so it is not costing the farm anything.