This section of the book is from the "Stories of Animal Sagacity" book, by William Henry Giles Kingston.
Mr Smiles, in his Life of Rennie, tells us of a horse called Jack, who showed himself to be fully as sensible as the two animals just mentioned.
Jack’s business was to draw the stone trucks along the tramway during the erection of Waterloo Bridge. Near at hand was a beer-shop, frequented by the navvies and carters. Jack’s driver, named Tom, was an honest fellow, and very kind to Jack, but too fond of spending more time than he ought to have done in the beer-shop. Jack, though a restive animal, got accustomed to Tom’s habits, and waited patiently till an overlooker startled him into activity. On one occasion, however, the superintendent being absent, Tom took so long a spell at the ale that Jack became restive, and the trace fastenings being long enough, the animal put his head inside the beerhouse door, and seizing the astonished Tom by the collar with his teeth, dragged him out to his duty at the truck. Great in consequence became the fame of Jack amongst the host of labourers.
Like famous Jack, do not hesitate to remind a friend of his duty, even though you have to seize him by the collar and drag him away to perform it.