Carlson is a ranch-hand who complained a lot about how Candy’s dog smelled. Eventually, he convinces Candy that putting the dog down would be the best thing to do. To make Candy feel better, he promises that he will make sure that the dog will not suffer. A significant quote from Carlson comes toward the end of the book - "Now what the hell ya suppose is eating them two guys?" This shows that a lot of people could not understand why George is distraught after shooting Lennie.