When I used it I had very good results. One of my lab had chronic ear infection for almost 10 years and by changing his food to Innova it cleared his ear infection completely and it never returned.
Sorry, but I wasn't pleased with the results for my dogs.
Their coats became dull, flaky and greasy. They were itchy like crazy, all the time,
including fussing with their ears. They did much better on the California Natural
line.
I a dog has a problem with Innova and does well on the California Natural then I would suspect one of the ingredients. The advantage of CA Natural products is that they are simpler, with fewer ingredients. If your dog does have issues with foods then I would suggest the CA Natural.