I've heard about Canidae switching the formula. REALLY sucks. =(
Are you worried about Diamond because of the whole aflatoxin scare? I don't blame you, but, I've read that Diamond is getting their stuff together and being very careful about testing the foods they produce. I feed Taste of the Wild for kibble meals, which is also made by Diamond, with no problems! It's an awesome food.
If you simply cannot stand foods produced by Diamond... I don't recommend BilJac. One word: corn! Yuck. I really like Natural Balance, for it's quality, and the price. It's probably around the same price as BilJac, but with way better ingredients IMHO.
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