Based on posts read on this site a couple years ago I switched my Labs to Diamond Naturals Extreme Athlete - since then my 7 year old male has experienced runny eyes, large ugly swellings between his toes, and recently started licking his paws raw and scratching large areas of swelling all over his legs and back raw. Per the vet these are classic symptoms of allergic reaction to food ingredients, particularly Diamond brand products (her words not mine). Not entirely believing her I have done some online research of my own and found a great deal of negative info on Diamond brand products - particularly with regard to allergic reactions and bacterial infections related to its use. Not happy as I had just purchased a 40 pound bag of it - but I'm dumping this crap and looking for something to replace it before my dog licks / scratches himself to the bone (I'm currently treating open sores caused by him licking / scratching the swollen areas) Obviously YMMV - my 3 year old has shown no adverse reactions - but I'm switching her too to avoid yet more vet bills for an easily preventable problem. BTW Diamond is apparently notorious for denying any problem with their products, and only did their 2012 under extreme duress. My advice is to avoid their products altogether.