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Your question is vague. Initially, Beatty sends the Mechanical Hound to Montag's house because Beatty suspects that Montag is hording books. He does this to warn him.
Then in the final part of the book, when Montag is the subject of a televised nation-wide man hunt, another hound is sent after him. This one has been programmed to track Montag's scent and to kill him. He is only able to escape it when he plunges into the river. Finally, when he meets up with the "book men" in the country, one of them gives him something to drink that will change his scent and through the hound of his trail.
He commits suicide by setting a Mechanical hound to his own chemical complex.
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