I used to feed my Bulldogs Science Diet because that's what the vet. recommended and sold. Also, that was the breeders recommendation.. Years ago, like mid to late 90s a gal that went to peoples houses and took care of pets when they were gone, opened her own pet food store. She was knowledgeable and I went with it her suggestion. Our Bulldog developed hot spots--large patches with no fur. I got him back on Science Diet Lamb and Rice and the hot spots filled back in and never reappeared. Because of that I stuck with SD. Fast forward to 2010 (I think) when I found EBN and actually learned something about dog food and allergies. I had both EBs tested and both dogs were allergic to the first 5 or 6 ingredients in SD. So what I thought wasn't broke actually was. I had to get NVI Ltd. Ingred. for both of them. Turkey for Ruggles and Lamb for Mack. Usually dogs don't get food allergies until they are over 1 year.