"Cyril! Find CYRIL! FIND him!" To the super-wise collie, there was nothing confusing in the command.
Like many another good dog, he knew the humans of the household by their names; as well as did any fellow-human.

And he knew from long experience the meaning of the word, "Find!" Countless times that word had been used in games and in earnest.

Its significance, now, was perfectly plain to him.

The Master wanted him to hunt for the obnoxious child who so loved to annoy and hurt him.
Lad would rather have found anyone else, at the Master's behest.

But it did not occur to the trained collie to disobey.