Every Purina PRO PLAN diet contains 100% of all the essential nutrients in every serving. We select high quality ingredients such as chicken, lamb and salmon pieces so the nutrients are better absorbed. That way more of them can be used by key parts of the body making more of a difference to all-round health. However, at Purina PRO PLAN we go beyond just high quality ingredients, providing even more because our products also contain a combination of extra nutrients such as OPTISTART, OPTIBALANCE, OPTIAGE, OPTIDERMA, OPTIDIGEST, OPTIWEIGHT and OPTIPOWER. Each of them selected applying scientific knowledge to deliver specific nutrition to each product, proven to provide targeted benefits. We call it OPTINUTRITION.If your dog has trouble with a sensitive digestion, help him make the most of mealtimes with food that is specially tailored to his digestion and size. OPTIDIGEST helps improve microflora balance and promotes good quality stool, thanks to the inclusion of natural source of prebiotic (scientifically proven to increase bifidobacteria for a better gut microflora balance) egg and bentonite, a natural clay.The balance of vitamins and minerals has been adjusted specifically for medium-sized adult dogs, and it is also suitable for gestating or lactating bitches.