After reading the information posted about the best dog foods, I changed Penelope's diet 2-3 weeks ago. She had so much itchiness and seems to still have it. Ears, eyes, her who who, and so on. Her eyes weep a lot. I switched to Zignature after talking the pet store lady. She said it could be a few months before I notice any changes with Pen's itching. Of course some of it could be seasonal allergies on top of yeast.