Have you tried the pro plan salmon? I would maybe try a small bag (as a base) and see if it makes a difference. https://www.chewy.com/purina-pro-plan-focus-adult/dp/128666?utm_source=google-product&utm_medium=cpc&utm_campaign=f&utm_content=Purina%20Pro%20Plan&utm_term=&gclid=EAIaIQobChMIiP20r6vj3AIVhISzCh0QfwlYEAQYASABEgLgk_D_BwE
I don’t see chicken meal listed as an ingredient.
Otherwise the most accurate way to rule out food sensitivities would be a prescription/therapeutic diet via your vet. But, the vet will tell you not to add anything, no treats, etc
It’s very hard to stick to.
PS add a little water to the kibble, makes it easier to digest.
