When your big dog is over 6 or your medium-sized dog is over 8 years old, you might want to consider adapting his food to accomodate his newest chapter in life. When dogs reach a senior age, they tend to be less active. If left unchecked, this can lead to various medical problems including obesity. To prevent this, Virbac Senior Dog food for large and medium breeds will keep your senior dog healthy by providing him only with the necessary nutrients. Any excess fibres or fat is tossed and replaced by supplements benefiting the health of your older dog. This way he or she can enjoy his nice old age by slouching on the couch in peace.