I sometimes mix in others but my group still prefers the Walmart Gourmet dry food. I tried the Kibble and Bits for a while but they didn't do as well on it. I can tell the difference just by picking the cats up.I've been using canned Friskies and dry Purina ONE for a while now, after trying probably every single brand out there. Maybe the ingredients aren't the best but I have the best results with them. Maybe Purina is magic or something, lol.