Science Diet is, indeed, primarily corn kibble loaded with by-products and synthetic vitamins and minerals. It's an incredibly wise choice for you to switch foods and I give you kudos! Innova, in my honest opinion, is one of the best foods. Regular Innova contains superior ingredients and is head and shoulders above SD. An even better kibble for your adult dog would be Innova EVO which contains minimal carbohydrates and virtually no grains, a healthy mimic of the raw diet. My Pekingese had been hopelessly deteriorating on various "top" kibbles like Wellness, Wysong, and Chicken Soup for the Dog Lover's Soul. At five years of age, he was droopy, lethargic, and could barely keep up on our usual walks. There was a noticeable decrease in energy and I knew it was time for a drastic change. As a result, I switched him to Innova EVO/homemade diet since he was too stubborn to eat a 100% homemade diet and I was, admittedly, too chicken to go all out with my aging pup Within a few weeks, his energy dramatically increased and his fur was simply glowing and full. Plus, for the first time in his life, he began producing small, firm poops!

Canidae, although it is, in my opinion, is not as top-notch as Innova/EVO, it certainly gives you the most bang for your buck. The ingredients are, without a doubt, superior to SD's and many of the other brands available. Though I wouldn't venture so far as to say it is the best out there, I will admit that a VAST majority of Greyhound owners feed Canidae and/or Nutro due to the availability and relatively "minimal" costs. It is a GREYT food for its price tag and I would definitely recommend it. Good Luck and happy shopping!