Originally Posted by vanillasugar
In my opinion (and maybe I'm just more definate about what I consider good and bad cat food) Iams is pretty poor quality in the grand scheme of things. Nutro is in the higher end, but is not one of the BEST premium foods. Feeding Nutro would be a step up from Iams. Iams and Eukanuba USED to be the best foods on the market, but their formulas have changed, and many new foods have been developed since that was the case. You can change without causing stomach upset if you do it gradually, easing from one food to the other.
Also, I don't know how many cats you've got, but 20lbs is a LOT of food. Unless you've got 4 or more cats, it's probably losing a great deal of nutritional value by the time you get to that last part of the bag. A guideline I use is not to buy more than you'll use in at least a month and a half, to ensure the food is still fresh when you get to feeding it!
Even if you seal it up tight? I go by the one-bag-a-month deal, which means I only need the 4-5 pound bags, but the store I shop at stopped selling the 5 pound bags of Felidae, so I had to go with the 20 pound (which is the first time in my life I've bought a bag of cat food that big, lol). It has a resealable flap, which I think will slow it down, but you're right, the nutrition will probably be a little degraded when I finally get to the bottom of the bag in a few months. I should invest in a container and store it in that instead
And yeah, Nutro Natural Choice is much, much
better than Iams, though I have to reread the ingredients to judge if Iams is better or worse than Nutro Max. If you have a feed store or low-chain pet food store, you can find even better food.