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Carlson was troubled by the smell of Candy's old dog.The dog is old, arthritic and the smell probably comes from the fact that the dog's kidneys are slowly failing. Candy said he just didn't notice the smell because the dog had been with him so long. Eventually, Candy allows Carlson to shoot his old dog to "put him out of his misery'. Carlson takes his own gun and kills the dog with a shot to the head. Later, Candy says he should have done the job himself. This event foreshadows the death of Lennie, who George kills with Carlson's gun. George realizes he must take responsibility for Lennie and not let others harm him.
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