Redbarn’s Protein Puffs are an innovative, tasty, and healthy treat for dogs! Our peanut butter flavored Protein Puffs are packed with protein derived from human-grade caseinate, commonly used in health supplements, snacks, protein bars, and diet products. Redbarn’s Peanut Butter Protein Puffs for dogs not only offer 75% protein and less than one calorie per treat, but also help fuel your pup with essential amino acids. Protein Puffs are the perfect treat, training aid, or food topper!.