He heard Lennie’s whimpering cry and wheeled about. “Blubberin’ like a baby! Jesus Christ! A big guy like you!” Lennie’s lip quivered and tears started in his eyes. “Aw, Lennie!” George put his hand on Lennie’s shoulder. “I ain’t takin’ it away jus’ for meanness. That mouse ain’t fresh, Lennie; and besides, you’ve broke it pettin’ it. You get another mouse that’s fresh and I’ll let you keep it a little while.”

– John Steinbeck

Of Mice and Men, Chapter 1. Though a big man, Lennie is like a child. But he doesn’t know his own strength and when he pets mice usually ends up killing them. George really cares for him and there is a strong bond between them. But the relationship is a bit like a master and his dog, with George sometimes being very mean to Lennie, and then again very sympathetic.