Consider Using an Anti-cribbing Collar
Now, this is a bit of a controversial solution as its effective percentage is very low. Anti-cribbing collars contain a metal object near the place of a horse's throat. So, when the collar is fitted around its neck, the metal becomes a cause of irritation and discomfort, making it difficult to suck in air when it cribs. However, this is technique is not recommended on a permanent basis as there have been reports of increase in stress levels due to its usage.