My cats are put onto the hills s/d (wet food) for a week or so whenever they have flair-ups, and then on a maintenance of c/d (dry). I have 2 cats, bought the new bag of c/d today, the previous bag I bought on the 1st August and it's $69 a bag. So for 2 cats, $69 for almost 2 months works out to under 50c/food/day/cat which is worth it in my book - specially when a consult is $50 etc. Plus happy cats!