In general, dogs of seven years or more start taking life a bit easier, and as a result their nutritional needs are different to those of younger dogs.  In large breeds, this change can occur even earlier.  Senior dogs are less active with a slower metabolism, so can be prone to gain weight, and they may also require support for their ageing joints and immune system.  They therefore require a high quality tasty diet such as Nutriment's Senior Formula with easy to digest protein, lower calories and a balance of essential nutrients