My horse donney does the same thing, he is just a horrible cribber. Cribs on everything. It is better when he is ridden everyday and turned out at least 8 hours, but he will crib on the water trough too. We feed him U gard and it has helped out some. He cribs straight through any collar too, and he gets more upset if one is on, and tries to crib more. He also cannot keep on weight unless he is being worked a lot, turn out is not enough for him to even slightly keep weight, but if he is worked he keeps weight fine and cribs a little less.