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I had been buying dog food available in the supermarket for ever. I went to our local pet food store and queried about my dog's (Golden Retriever) habit of passing very smelly farts. She suggested to swap over to a dog food which was free of fillers so I chose the Black Hawk Fish and Potato. The change has been amazing! Our 9yo goldie now rarely stinks the house out and his bowel movements have improved out of sight! It is quite expensive, but totally worth it for our dog's improved well being.