Jock, the ugliest bull-terrier pup in the litter, grows up to to be the wisest of them all. With his master he shares the excitement of a transport rider's life in the early days of the Transvaal gold rush; they become close companions and all Jock's skill and intelligence are needed in many thrilling and dangerous encounters with big game.

This tale has become a classic among animal stories and today it is as fresh and exciting as when it was first told.