Bests & Worsts Reviews from Amazon

I have been buying blue buffalo dog food for almost two years. My dog loved it until two months ago. She stopped wanting to eat. She walks everyday for an hour and a half so she is always hungry. I knew something was wrong, I brought her to the vets they ran blood work, stool sample and could not find anything. She has been having diarrhea for the past few weeks. Then yesterday morning threw up all of her food. I went online and read reviews about people purchasing dog food on amazon and having the same issues I am having. I am a faithful amazon shopper. But I am very disappointed. I now have a large amount of dog food that I purchased and is going to get thrown out. I purchased a bag of dog food (different brand) at a local store, filled her bowl up and she ate the whole thing like her old self. Is it something wrong with blue buffalo or the way it is being stored/shipped? I would prefer to order my dog food through amazon as it is more convenient but my dogs health is more important to me. Please fix this problem amazon so that I can again order her food through amazon.