It seems like every time you post you are trying a new food. I don’t see how you determine whether your dog will do good on any of these foods or not. Like Anon said, it typically takes a few weeks to determine that.
I cannot imagine all your constant switching and adding new things is very helpful if your dog is supposedly so sensitive and does not tolerate much. If you have found a food that he can tolerate leave it at that. If he truly has that many issues with so many brands it’s not worth it to constantly switch and add things just to please his taste. I’m all for feeding a food that my dog likes but sometimes like in your dog’s case that might just not be plausible. Put the food down and nothing else, stop bribing him and he will eat it when he is hungry. He will quickly learn that that food is all he gets. Stick with the food he does good on. You put your dog through a lot of digestive stress because you are so indecisive.
Good luck to you and your dog
