But when Dick was inclined to be boisterous, Crusoe's tail and ears rose at a moment's notice, and he was ready for anything.

Moreover, he obeyed commands instantly and implicitly.

In this respect he put to shame most of the boys of the settlement, who were by no means famed for their habits of prompt obedience.
Crusoe's eye was constantly watching the face of his master.

When Dick said "Go" he went, when he said "Come" he came.

If he had been in the midst of an excited bound at the throat of a stag, and Dick had called out, "Down, Crusoe," he would have sunk to the earth like a stone.