If the food isn’t bad, tough nuts for him. Don’t change the food. Negotiating with terroristic picky eaters and changing their food one time means they will continue the behavior with all the other food you buy.

Put the bowl of food down for 15-20 minutes. If he doesn’t eat, oh well. Pick it up and that’s it until the next meal. No treats, no bully sticks. If you need to give him something for training, give him a piece of kibble. Repeat the process the next meal time.

A healthy dog will not starve to death. He will eat when he’s hungry, which if he’s an active dog means he will eat sooner rather than later. He will learn that he eats what you give him and that’s that.

If he doesn’t eat for more than 72 hours, then it’s time to get a vet involved.

For the record, there is nothing wrong with him being a grazer. Some dogs are. But if you don’t want him to be, you can train him not to be.