Plato Pet Treats Chicken Thinkers are FREE from added sugars artificial preservatives by-products artificial colors protein-meals soy wheat corn fillers and freeze-drying. Slow roasted in our own US Facility these treats can be snapped into pieces for training dogs of all sizes or to share. Plato Thinker Sticks are grain-reduced with gluten free brown rice being the only grain ingredient. Brain-nourishing natural DHA and EPA helps support brain function in your dog.