I really LOVE the idea of this food, but my Rottweiler keeps getting ear infections! I rotate between Origen Fish, Adult, and Evo Red Bites, but her ears seem to be worse with the Evo. Is this a problem for anyone else? When we do switch the food, the introduction is gradual so I am not sure if that's the problem. The only complaints I have ever heard about this food is that there might be too much protein for a small dog - but she's a Rottweiler! What's up?