There is no bad list. There is no good list. Please discuss with your vet. All kinds of bogus information on the internet.
The only good food is the food that agrees with your dog. It does not matter how other people’s dogs have done on it.
And judging by the amount of various foods you have tried, if I was you I would get a referral for a internal medicine specialist if your dogs issues continue. Especially if you have tried prescription/therapeutic food through your regular vet without positive results.
Also, 2 or 3 servings mean nothing, it takes at least a month to see if the food agrees with the dog.
PS: Maybe your dog is sick? A healthy dog has a good appetite.
Has he had a thorough workup? Labs? What did his last bloodwork look like?
