After an idyllic existence as a foal, the time has come for Black Beauty to make the difficult transition to adulthood. At the start of chapter 3, Black Beauty has reached the age of four. Squire Gordon comes down to the field to take a good look at the horse. After a close examination, he concludes that the time is right for Black Beauty to be broken in. This means he needs to be taught how to wear a saddle and bridle.

Black Beauty's used to wearing a halter and a headstall, but a bit and a bridle are a whole different matter. Having a bit in his mouth is a horrible experience for the young horse; it's not very nice having a piece of cold hard steel the width of a man's finger shoved into your mouth. Even worse, the bit's secured by uncomfortable straps that fit tightly around the nose, chin, and throat. But Black Beauty soon gets used to it. He knows that his mother and the other horses have to wear a bit and bridle; and the master was ever so careful when putting them on, making the whole experience much easier for the young horse with a combination of gentle patting, soft words, and oats.

The master's also very gentle when he puts the saddle on, which is generally a much more pleasant experience for Black Beauty. Again, it's amazing what some oats and a little TLC can do. One morning, the horse's master rides him around the meadow on the soft grass. It feels more than a little strange at first, but Black Beauty soon feels incredibly proud to carry his master, and each day he becomes more and more accustomed to it.