At first I didn't think it wouldn't work because he wouldn't eat his food with just the powder on it. I tried mixing with various appealing additions and discovered he will eat FreshPet with the powder mixed in with it and the on his kibble. Sometimes he leaves the kibble, but he always eats the FreshPet and powder. Through the process, the PPL team was in touch with me and even offered a refund. I decided to stick it out and it seems to be working great.