The old man came slowly into the room. He had his broom in his hand. And at his heels there walked a dragfooted sheep dog, gray of muzzle, and with pale, blind old eyes. The dog struggled lamely to the side of the room and lay down, grunting softly to himself and licking his grizzled, moth-eaten coat. The swamper watched him until he was settled. "I wasn't listenin'. I was jus' standin' in he shad a minute scratchin' my dog."

The old man came slowly into the room. He had his broom in his hand. And at his heels there walked a dragfooted sheep dog, gray of muzzle, and with pale, blind old eyes. The dog struggled lamely to the side of the room and lay down, grunting softly to himself and licking his grizzled, moth-eaten coat. The swamper watched him until he was settled. “I wasn’t listenin’. I was jus’ standin’ in he shad a minute scratchin’ my dog.”

– John Steinbeck

Of Mice and Men, Chapter 2. Candy has a very close relationship with the old dog, a bit like George’s friendship with Lennie.

John Steinbeck Quotes