What's in a hot dog?

I'm more a burger girl and on the rare occasion I eat a hot dog it's from a street hot dog stall. As a kid, I was taught cheap ones were made from beaks and claws while the good ones used lips and assholes.

However a Google of hotdog ingredients throws up pork, beef, turkey, and chicken, either separately or as a combo. So when it comes to eating dogs, what should it be?
Whats in a hot dog?
Whats in a hot dog?
Whats in a hot dog?
Whats in a hot dog?
Whats in a hot dog?
What's in a hot dog?
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