[Patti S]

A lot of it depends on your dog’s activity levels. If your dog is doing well on his current food, there’s no reason to change it, simply because of his age. You might want to read this short article:

http://healthypets.mercola.com/sites/healthypets/archive/2011/05/05/surprising-findings-from-tufts-study-of-37-senior-dog-foods.aspx