As a member of our grain inclusive series of dog foods, NutriSource® Senior Chicken & Rice Recipe is formulated to meet AAFCO guidelines for maintenance of adult dogs. See the size of this kibble. NutriSource® grain inclusive formulas deliver compact nutrition and include prebiotics and probiotics to help support a healthy gut. Balanced Omega-3 and Omega-6 fatty acids along with L-Carnitine, taurine, choline chloride and DL Methionine supplementation to promote heart health make NutriSource® grain inclusive formulas stand out.