Bucking is a movement performed by a horse or bull in which the animal lowers its head and raises its hindquarters into the air, usually while kicking out with the hind legs. If powerful, it may unseat the rider enough to fall off, Bucking, though a potentially dangerous disobedience when under saddle, is a natural aspect of horse behavior. It developed in the wild for the purpose of protection from predators such as mountain lions. The process of kicking out with both legs, another defense mechanism for the horse, also results in a mild bucking movement. Thus, for a human to ride a horse, the horse has to be desensitized to the presence of something on its back. Nonetheless, because the instinct is there, bucking can still occur for a number of reasons, Happiness, such as when a horse bucks during a gallop because of enjoyment. General excitement, such as horses that buck in a schooling ring or at the beginning of a ride in a crowd of horses. The riders aids are causing confusion or fear in the horse, the horse is fresh, having been kept up in a stall for a long period of time, and is releasing pent-up energy. Pain, which may be due to a saddle or another piece of equipment, tooth problems. Provocation, usually due to a bite which the horse is trying to rid himself of. Untrained horses may instinctually buck the first few times they have a saddle on the back if not given proper ground training and this is an instinctive defense mechanism. Having found that bucking the rider off results in not having to work, disobedience to the riding aids, when a horse does not wish to do what is asked by the rider. Sometimes this is due to riding on the part of the person. Rodeo broncs are used specifically as bucking horses, usually bred to be prone to bucking, fear of loud and noisy machines, like cars, trucks, trains, and planes. Ordinary riders need to learn to ride out and correct a simple buck or two, because it is a common form of disobedience. The classical dressage movement known as the Capriole is also similar to the low buck done by a horse when it kicks out with both hind legs. Bucking, especially if triggered by fear, pain or excitement, is generally a minor disobedience, unless it is enough to unseat the rider. If bucking is an act of the horse and becomes an undesired habit
Rodeo horse bucking.
A loose horse may buck due to aggression or fear, as the very high kick of this horse suggests
Bucking is a normal behavior for a horse with an overabundance of energy, and in a loose horse, may simply be playful behavior, as here
Horse bucking as an act of disobedience or discomfort