Have you heard of NutriScan test by Dr Dodds? This would be better for food intolerance/ sensitivity. I got Turbo tested bc he was throwing up all the time.
NutriScan Food Sensitivity and Intolerance Test for Cats and Dogs
Turbo can't have chicken, turkey, venison & white fish but is ok w/corn, oats (all grains), potatoes, etc. I feed them Primal & Stella & Chewy's, he mostly gets duck, pheasant & rabbit. He didn't like frozen, so he was eating the freeze dried versions, but he likes the frozen again! Ever since avoiding the proteins he can't have, he has not thrown up. The nutriscan test was a life saver for us.
If Buster Brown has yeast, it's best to avoid anything 'sugary'. No potatoes, no grains, basically no carbs as these foods high in sugar fuels the yeast. It's very itchy for the pups...all over, Princess suffered from yeast infections (she had numerous skin scrapings to confirm this). Now that she's on a 100% (premade) raw diet, her yeast is gone. She still has her enviro allergies tho, but it's not as bad.
I did feed them Canine Caviar when they were eating kibble. They did great on it. I chose it bc it didn't have potatoes, wasn't a bz food & they liked all the grain free versions.