"It's a dog eat dog world, and Mr. Perfect is a Milk Bone"

This quote is a humorous way of saying that life has plenty of competition and that it is hard to succeed. The phrase "canine eat pet world" is a metaphor for a world where everybody is out for themselves and will do whatever it takes to get ahead. Mr. Perfect is a referral to an expert wrestler, and the Milk Bone is a kind of canine reward. This is a funny way of stating that even someone as successful as Mr. Perfect is still just a canine in the grand scheme of things. The quote is a tip that no matter how successful somebody is, they are still based on the same battles and competition as everyone else. It is a tip to remain modest and to remember that success is not guaranteed.