"An ordinary watchdog would just scare away thieves or bite them.

Lad captured the thief and then brought the stolen jewelry back to us.

No other dog could have done that." Lad, enraptured by the note of praise in the Mistress's soft voice, looked adoringly up into the face that smiled so proudly down at him.
Then, catching the sound of a step on the drive, he dashed out to bark in murderous fashion at a wholly harmless delivery boy whom he had seen every day for weeks.
A watchdog can't afford to relax vigilance, for a single instant,--especially at the responsible age of five months..