What all have you tried feeding him other than the science diet and blue buffalo? Did you take him off the probiotic after you got the vet diet for him? Are his poops ok now that he’s on the vet diet? Why did you switch off blue? It’s odd to me. I’ve had some people use the science diet and that usually works for them. It isn’t the best. Blue in my opinion is much better (but still not the best) however usually dogs that aren’t even sensitive to anything have issues when switched to blue from my experience.
