Plato Duck Thinkers are FREE from added sugars, artificial preservatives, by-products, artificial colors, protein-meals, soy, wheat, corn, fillers, and freeze-drying. Fun to snap and moist for training dogs of all sizes. Plato Thinker Sticks are grain-reduced with gluten-free brown rice being the only grain ingredient. Brain-nourishing natural DHA helps support brain function in your dog. Flavors include pacific salmon, duck and chicken. Demand responsibly sourced ingredients.