Crib-biting is a type of stereotypical behaviour seen in horses and it is considered a stable vice. It can have a negative influence on the animals health. The horse grabs a solid object with its upper incisors (usually a stable door or fence) and tenses certain muscles of the neck and throat, resulting in a typical arching of the neck and the sucking of air into the windpipe.

Windsucking is similar behaviour performed without the horse grabbing a solid object. The cause of either vice is presumed to be lack of exercise, lack of contact to other equines and insufficient forage. The existence of a genetic predisposition or involvement of stomach ulcers as a cause (and an effect) are also likely. Crib-biting and windsucking have been linked as a causal effect to colic.