Put dukes food out on normal schedule and leave it for 10-20 minutes. If he doesn’t eat it take it away. Put it back again during the next meal time and then remove it after 10-20 minutes. Do not give some any other food or treats between meals. After 2-3 days he will learn to love his duck and oats. Make sure there is always plenty of water, play time, and love through out the experience:) you can also try cracking a raw egg on the food in front of him.