NB guarantees their food 100% take it back to the store you purchased it from and explain the problem your having with the new formula. On the website it says to gradually introduce the new formula to the diet because its going to be much richer than the old formula. It states on the bag that its the new formula and you can't be mad at the company, you must read the label on the bag. If they don't like the new formula try other proteins such as fish and sp or the venison/sp

Princess 21, looking at all your comments you have left it appears you are a representative of Natural Balance. Natural Balance has done a poor job communicating its formula change of Duck and Potato and based on the number of poor ratings, you should know your company dropped the ball.

Our eleven-year old golden retriever Bailey has been on Natural Balance Duck and Potato for almost a year with great success. Then they changed the formula (unfortunately there was nothing on the bag to indicate a change had been made). Bailey immediately began having diarrhea so we called the manufacturer and found out about the change. At that point, we didn't have any of her old bag to mix with the new formula so we put her on a bland chicken and rice diet and very very very slowly began to add the duck and potato formula back in. Every time we get to 100% duck and potato, Bailey gets sick again. We are back to chicken and rice for the fourth time... starting all over again!

Now that I see others are having this same difficulty, we are definitely going to make a switch to another brand. We no longer trust Natural Balance and will never go back. In fact, I found out yesterday a friend with a golden retriever also on this diet has had the same problem and spent hundreds at the vet. She has since switched to Buffalo Blue Fish and Potato diet.