TSC has a good brand, 4 health. No wheat, corn, or soy. I can't remember how much it is. I've never liked science diet. We use Purina one also and like it. I think it's one step above (price wise) the regular Purina dog chow.
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I justify the price of the 4-Health by how much it saves me on money spent on 3 different medications that only last a month. And Sugar is happy.