Montag attempts to confuse the Hound by changing his scent.
When Montag and Faber are about to part ways, they attempt to mask Montag's scent so that the Hound won't be able to pick it up. Faber fills his valise (suitcase) with some of his old, dirty clothes and closes it to make it airtight. He gives the suitcase to Montag who then douses it in whisky to give it a different scent. When Montag reaches the river, he wades in, douses himself with the rest of the whiskey, and then he puts on Faber's old clothes. Then, Montag floats down the river and the Hound ceases chasing him. When Montag reaches the other outcasts, they give him something to drink which will effectively change the scent of his sweat.
"My name's Granger." He held out a small bottle of colourless fluid. "Drink this, too. It'll change the chemical index of your perspiration. Half an hour from now you'll smell like two other people. With the Hound after you, the best thing is Bottoms up."