I have been using Simply Nourish that I buy at Pets Smart. I have a poodle with very bad skin and allergy isues. When I first bought this brand, I selected a formula that is very vegtable rich and low grain. My dog responeded wonderfully and his skin issues improved greatly. I made it through last fall through winter, but in the spring of this year I noticed the issues were coming back. I thought it was just the spring and allergy season and back to the vet we went for antibiotic treatment and steroid. I hate giving him all those meds. Well, long story short. We had another vistit last month to try and give him some relief. I had stayed with the same brand of Simply Nourish, but around Christmas time last year, I went to the ALL Grain Free formula. That was my only change. So this month, I put two and two together and wondered if the forumula change might be an issue. I went back to the Low Grain Formula and guess what his skin issues have improved greatly in the last three weeks. I have no idea what the issue is, but for my furbaby, just a slight differnce in the food, made a huge difference. I wish you well with you choices.