I will try to find the link that I have...it actually lets you grade different foods. We switched ours from Canidae to Nature's Variety based on this grading system. Canidae scored 112%(A+) and Nature's Variety scored 128%(A+). Even though Nature's Variety scored higher, Canidae is still an EXCELLENT food. Our dogs liked Canidae but they LOVEEEEEEEEEEE Nature's Variety!!

If they had not been so receptive to the change, we would have gladly gone back to Canidae. (We also switched our kitties from Felidae...Canidae's cat food. They also love their Nature's Variety the best.)
Hope this helped some~
Tammy