Answer:
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
I am the kind of dog that chases anything red. What am I?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
I begin your sentences.
I can be thin but not fat; in your body but never on your placemat. I'm always better when I'm fresh but you'll never see me in the flesh.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.