In honor of today being Hot Dog Day, here's a bit more info about America's beloved baseball standby. Hot dogs were created in Frankfurt, Germany — hence the name frankfurter — in 1852. In 1904 American sausage importer Antione Feuchtwanger sold his curved dogs in a bun. Originally he gave customers gloves to hold and eat the dogs but the gloves disappeared quickly, so he worked with a baker to develop a bread bun to hold the hot dogs.
Simply put, a hot dog is a type of sausage containing meat, meat fat, grain filler (bread crumbs, flour, etc), a little egg white, and spices (garlic, salt, pepper, etc). Almost all packaged hot dogs are pre-cooked and most are stuffed into synthetic collagen casings.
In 1893 the sausages became popular at baseball parks. Today, Americans consume over 16 billion dogs per year with each region and baseball stadium serving up a distinct style of dog.
I prefer mine with spicy mustard, how do you like your hot dogs??
Source: Made How
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But usually I like them with ketchup and mustard with a pickle. 
I like mine "all the way".