Hi, I used to train my 3-month-old pup for around 5 minutes just before mealtime, totaling 15-20 minutes per day. He would listen to my commands and respond well to training until two weeks ago. However, he suddenly stopped responding to training and shows no interest. I recently changed his diet from kibbles to curd rice, then to plain curd with Cerelac, and occasionally add banana pieces (which he eats sometimes but leaves other times). He refuses to eat boiled veggies, mashed or not. He now eats plain curd with Cerelac without complaints. How can I get him to respond to training like before? Should I skip a few meals to make him hungrier and more receptive to training? When I use his food as a training reward, he ignores both the food and commands, but when I leave the bowl, he starts eating.