We feed TOTW...the lamb and potato I think it is (purple bag.)
Here is what makes a HUGE difference for us. I add an omega 3 oil to the food and they go crazy for it. If I don't use the oil they don't care to eat it at all. The omega 3 oil is good for soooo many reasons, so adding to make their food more appealing to them is just a bonus.
We use the Nordic Naturals Omega 3 Pet.
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You can order directly from their site. I love this stuff!