Plutos Seniors, specially produced for Senior dogs, they are softer than adult chews, allowing dogs to chew without damaging their teeth and gum. Being softer, they are also easier to digest. Casein - high quality Milk Protein (lactose and fat free) (human grade) rich in essential amino acids, calcium, and phosphorus. APPLE - rich in fibre and vitamin C. Krill Protein - rich in omega-3, and astaxanthin. Omega-3 is an anti-inflammatory supplement, beneficial to the skin and coat of dogs, while improving mobility by supporting stiff and painful joints. Research has shown that Omega-3s for dogs can control inflammation and aid in wound healing. Choline - supports several vital body functions and can provide a wide range of other health benefits. Astaxanthin - is one of the most sought-after antioxidant supplements today - and for good reason. Not only is a powerful antioxidant, it also has anti-fatigue and anti-inflammatory properties, as well as a host of other health benefits. Dog chews are ESSENTIAL for dog's well-being. Dogs do need to chew. It gets them busy, it`s a good mental exercise, helps control their stress and anxiety, and cleans their teeth. Choosing a good and appropriate chew is particularly important. Plutos Senior probably the Healthier chew in the market.