Why does Carlson suggest shooting Candys dog? How does Candy respond? Chapter 2

Carlson complains about the smell of Candy's old sheepdog and tells him that he should put it out of its misery (shoot him).

"Got no teeth," he said. "He's all stiff with rheumatism. He ain't no good to you, Candy. An' he ain't no good to himself. Why'n't you shoot him, Candy?"

The old man squirmed uncomfortably. "Well- hell! I had him so long. Had him since he was a pup. I herded sheep with him." He said proudly, "You wouldn't think it to look at him now, but he was the best damn sheep dog I ever seen."

What is Curleys wife's name in mice and men?