The name puppy chow stuck to this Chex mix recipe because of its resemblance to dog food. The classic muddy buddies recipe was made with either Chex cereal or Crispix cereal, which are both gluten-free as they're made from rice or corn. The reason this dish is also called muddy buddies is that's another name referring to pups that get muddy after walking and playing. But don't worry - this party mix is puppy chow (and muddy buddies) in name only!