K9Cakery.com's all-in-one Dog Bone Shaped Cake Kit contains one package each of peanut butter dog cake mix that is sugar, wheat, soy and gluten free, and Fido's Frosting mix, both of which are all-natural and U.S.-made, according to the company. Other contents include a candle and a 7 in. x 10 in. bone-shaped foil cake pan. All product and packaging are biodegradable or recyclable, the company adds.