In a large skillet, brown the ground beef over medium-high heat, breaking up as fine as possible. Stir in tomato sauce, tomato paste, water, ketchup, onion flakes, sugar, chili powder, mustard, cumin, salt, pepper and celery seed. Heat to boiling. Reduce heat; simmer uncovered 15 minutes stirring frequently to prevent sticking.
Cut buns and hot dogs into bite-sized pieces; spread on the bottom of a 9x13-inch baking dish coated with nonstick cooking spray.
Spoon sauce mixture over top; sprinkle with onions and cheese.