My vet said I should consider putting my 12-year-olds (I have 2) on a senior cat food, but did not recommend a particular brand/formula. My head is spinning with everything I've read about cat nutrition lately (even just on this site). I've been reading a lot about not using commerical foods with grains and byproducts in them, raw diets, that wet foods are better on one hand but not good for dental health, that older cats require less protein due to potential kidney issues, etc. Any recommendations? I'm currently feeding them Purina Indoor and some canned food.