You could include some of the following points in your essay:
You might argue that he is heartless and shows little regard for Candy鈥檚 distress in allowing the killing of Candy鈥檚 dog.
He is unsentimental about the pups, showing his pragmatismThinking of or dealing with problems in a sensible and practical way., 鈥淚 would have had to drowned most of 鈥榚m鈥.
He is no better than the other ranch workers, he frequents Susy鈥檚 place.
He does nothing about how Crooks is treated.
He seems to encourage Curley鈥檚 wife鈥檚 flirtation by calling her 鈥済ood looking鈥.