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[Candy] said miserably, "You seen what they done to my dog tonight? They says he wasn't no good to himself nor nobody else. When they can me here I wisht somebody'd shoot me. But they won't do nothing like that. I won't have no place to go, an' I can't get no more jobs." (3.222)
Here's the thing: the world treats old men like Candy just as badly as they treat old dogs, and maybe even worse. They'll kill the old dogs, but they'll make the old men suffer.