Stewart Freeze-Dried Bacon PuffPops, Cheeseburger Recipe. The freeze-drying process locks in the nutrients and benefits of raw food. Made with real bacon and beef for a tongue-wagging taste that dogs love. Contains no additives and no preservatives. Free from corn, soy, wheat, grains, gluten, legumes, and lentils. High in protein with well-balanced amino acids for strong muscles.