As Montag watches the television in Faber's home, the announcer says the following about the Mechanical Hound:
"--Mechanical Hound never fails. Never since its first use in tracking quarry has this incredible invention made a mistake. Tonight, this network is proud to have the opportunity to follow the Hound by camera helicopter as it starts on its way to the target . . . nose so sensitive the Mechanical Hound can remember and identify ten thousand odor indexes on ten thousand men without resetting!" (133).
Montag watches as the television crew follows the Hound around town following his scent. The Hound starts at Montag's house where Beatty was killed by his own flamethrower. Once Montag knows for sure that the Hound has his scent and is on the way, he tells Faber what to do. First, Faber must burn everything Montag has touched. Then, he is to turn on the air-conditioning all the way up, spray the house with bug spray, and turn on his outside sprinklers. Montag then asks for Faber's dirtiest clothes in a suitcase and the whiskey.
Once Montag reaches the river, he wades out into the middle of it and undresses. Then he splashes the whiskey on his body, drinks some, and puts on Faber's old clothes. Next, he lets his clothes wash down the river as he wades deeper into the middle of it. Once he cannot stand anymore, he lets himself be swept away. He hasn't gotten down the stream more than 300 yards when the Hound and the helicopter approach the river; so, Montag dives to avoid the lights and the Hound's sense of smell.
"Then the lights switched back to the land, the helicopters swerved over the city again, as if they had picked up another trail. They were gone. The Hound was gone. Now there was only the cold river and Montag floating in a sudden peacefulness" (140).
It's pretty clever how Montag gets away. He uses water, bug spray, fire, whiskey, old clothes, and his quick wits to escape the nemesis that once worked with him, not against him. Montag's understanding of how the Hound works eventually enables him to trick it and escape.