This comic based on the old Adventures of Sonic the Hedgehog cartoon from the 90s.  For some reason, Sonic was obsessed with eating chili dogs. I guess the creators of the show just wanted to give Sonic a signature food, like the Ninja Turtles or Garfield.

In the games and other shows, Sonic is always trying to save animals trapped by Robotnik.  For such an animal friendly hero, it seems odd that Sonic would constantly dine on a meal that combines two very meaty dishes.  Well, maybe he just eats vegetarian chili dogs.  I guess this is like wondering what people eat in the Pokémon universe.