My dog won’t eat his food!

Every time I give him his kibble he just looks at it and then walks away. I’ve tried everything to get him to eat. I put a little water in it and he ate it like that for a couple days before he stopped. Then I put chicken broth in it and he just drank the chicken broth and spit the kibble out. I don’t know what to do, he doesn’t eat enough each day.