Purina pro plan senior mediumlarge sensitive skin optiderma salmon has been specially developed by nutritionists and veterinarians to meet the needs of senior medium and large breed dogs from 7 years that suffer from skin problems such as itchy or flaky skin this dry dog food contains the optiderma formula which is a clinically proven combination of vital nutrients designed to promote healthy skin and an attractive coat salmon is a source of high quality proteins and is used to reduce th