describe the mechanical hound

The Mechanical Hound is an android-like dog that tracks the scent of its prey with a vengeance. It also hunts illegal books or anything else that the state deems necessary. The Hound injects a poison into their victim which incapacitates them. The Mechanical Hound attacks Montag, and Montag destroys it with the flamethrower, but not before it stabs him with a needle full of anesthetic,

Light flickered on bits of ruby glass and on sensitive capillary hairs in the nylon-brushed nostrils of the creature that quivered gently, gently, gently, its eight legs spidered under it on rubber-padded paws. (Part I)