This section is from the book "The Horse - Its Treatment In Health And Disease", by J. Wortley Axe. Also available from Amazon: The Horse. Its Treatment In Health And Disease.
At three years old the embryo hunter is usually backed for the first time, but before any attempt is made to ride him he should be thoroughly accustomed to the sit of the saddle and the grip of the girths. This done, mounting and dismounting should be quietly repeated again and again until he is thoroughly familiar with what is required of him. The precaution of engaging the services of a light-weight rider if the breaker is a heavy man is most desirable, though it is preferable, if possible, for the colt to be first backed by someone with whom he is familiar. No attempt should be made at this time to bully him into submission if ho is disposed to be fractious; a snaffle-bit and light hands, supplemented by verbal remonstrances and a good seat, are all that the breaker requires, provided he is endowed with the golden gift of patience, as all breakers should be. If the colt manages to get him off, the rider will have reason to regret the mishap, for the pupil will have acquired a knowledge of his superior power, and will probably be desirous of repeating the operation; but he must speedily be remounted, and kept well at it, walking about, or trotting if his education has proceeded so far, in order to disabuse his mind of the idea that if he tries he can be master.
 
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