"Push the bone into the mouth as far as it will go."
And that's how you be a responsible dog owner.

This is literally the same game as Big John but with a different prop and a die instead of a spinner.

http://www.retrojunk.com/commercial/show/24872/big-john-game

There exists an entire subculture of men whose primary sexual responses have been molded by this toy in their childhood.

This is barely a game. It's just an excuse to make a fake dog poop.

I'd probably fill mine with CoCo Wheats for a more lifelike experience.

Just a reminder, if you're ever doing a birthday party for boys 4 and up, be sure to provide a tray of cat poop cookies: an aluminum pan filled with Rice Krispies, with some no-bake chocolate / oatmeal / peanut butter cookies strewn throughout. Serve with a clean-ish cat litter scoop.