How does Miller prove that Brown was his lead dog?

Skiff Miller gave some command to the dog and he followed it by making a swinging turn to the right and halting obediently at the command. In this way, Miller proved that Brown Wolf was his lead dog

chapter i -- paris: september, 1792

a surging, seething, murmuring crowd of beings that are human only in name, for to the eye and ear they seem naught but savage creatures, animated by vile passions and by the lust of vengeance and of hate.

during the greater part of the day the guillotine had been kept busy at its ghastly work: all that france had boasted of in the past centuries, of ancient names, and blue blood, had paid toll to her desire for liberty and for fraternity.

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