Senior dog food is one of the worst things to happen to the commercial dog food industry. basically senior dog formulas came about after protein started getting this bad reputation that it was making less active dogs fat (which is usually most senior dogs). However, what people didn’t udnerstand was that it was not “protein” that was the culprit it was the TYPE of protein. Proteins like corn can not be fully digested by dogs and thus end up breaking down into sugar and end up getting stored as fat creating the weight gain.
I found an article for you by a holistic vet that most of us on the site are big fans of for her all natural and holistic outlook on pet nutrition. She discusses the nutrition needs of senior dogs in this article and discusses the flaws in commercial dog food marketed towards senior pets.
http://healthypets.mercola.com/sites/healthypets/archive/2011/05/05/surprising-findings-from-tufts-study-of-37-senior-dog-foods.aspx
