Who said its a dog eats world and you are wearing milk bone shorts?

There is no known origin for the phrase "It's a dog-eat-world and you're wearing milk bone shorts". It's likely a made-up phrase or a humorous saying.

It's possible it's a variation of the common saying "It's a dog-eat-dog world", which means that people are ruthless and competitive in their pursuit of success.

The addition of "you're wearing milk bone shorts" likely adds a touch of humor to the saying, suggesting that someone is unprepared or vulnerable in a competitive environment.