The original smart-treat. Makes pills a treat to give! Fits most tablets. Why Greenies Pill Pockets Allergy Formula tests? Some dogs may be highly sensitive to commonly used proteins and carbohydrates often associated with itching and skin problems. Greenies Pill Pockets Allergy formula treats use a hypoallergenic recipe for dogs with sensitivity to common food proteins; have a novel protein source (duck); contain a single, easily digestible novel carbohydrate source (pea); contain a built-in pouch suited for hiding the medicine.