I have a 11 months GSD who hates packaged food. We tried everything - royal canine, pedigree, drools, packed chicken - but he doesnt like anything.We feed him twice a day with a mixture of rice/roti, chicken stock, chicken liver/gizzard/Eggs (usually 2 eggs at a time) and milk. We occasionally give him boiled vegetables. He is healthy and ideal weight. You can try that too.More than anything, he loves milk. Even if he isnt in a mood to eat, he finishes the milk. If your dog is intolerant, you can try curd instead of milk. You can give him vitamin supplements to ensure proper growth.