But, a single reproof was enough to cure him forever of the particular form of mischief which had just been chidden.

He was one of those rare dogs that learn the Law by instinct; and that remember for all time a command or a prohibition once given them.
For example:--On his second day at the Place, he made a furious rush at a neurotic mother hen and her golden convoy of chicks.

The Mistress,--luckily for all concerned,--was within call.

At her sharp summons the puppy wheeled, midway in his charge, and trotted back to her.

Severely, yet trying not to laugh at his worried aspect, she scolded Lad for his misdeed.
An hour later, as Lad was scampering ahead of her, past the stables, they rounded a corner and came flush upon the same nerve-wrecked hen and her brood.