It sounds like he’s intolerant of something in the food he’s eating currently. My dog with food intolerance issues gets an ear infection in his right ear when he’s expose to his triggers. I’d look for a lower fat, more limited ingredient canned food (if possible) like Weruva Human Style or Addiction. Take a look at this article: /best-dog-foods/suggested-low-fat-dog-food/
I’d also take a look at this thread: /forums/topic/dry-dog-food-with-low-salt-and-low-fat/
A poster, Gina, in that thread shared a list of foods that she researched that were low fat and low sodium. The list is limited to those brands she researched, but might be a good starting place.
