Spot the dog, on Wikipedia

Spot the dog was created by Ernest Hemingway writing under the pseudonym Eric Hill.  Spot was a tortured soul, and often wondered what things would have be like if he could undo all the mistakes he's made in his life.  He spends his sleepless nights wondering how his life would have turned out if his mother hadn't compared him to Clifford the big red dog every day, crushing his self-esteem, and making him turn to a meaningless life of booze and missed opportunities.  Ultimately, Spot represents that part of ourselves that regrets the things that we've done that we can never forgive ourselves for, the part of us that looks at ourselves in the mirror each morning and wonders "Why am I here, is any of this worth it?"  Ultimately, Spot is a reflection on all of us, a mirror held up to our modern society.