Collie's have such sensitive stomachs that they cannot handle Canidae especially the lamb since its a fatty protein and hard for them to digest. (I have a collie my self I know)PLEASE get her OFF "prescription" food thats the WORST food out there besides commercial dog foods!!! Have you even read the ingredients? Who cares what the vets say they dont learn anything about nutrition in vet school if they did they wouldnt recommend prescription nonsense which is CORN and by-products. Try Natural Balance Sweet Potato/Venison my Collie absolutely loves it and does very well on it.

You can check out petfoodauthority.com - they have lots of information about a lot of different brands of dog food (ingredients etc) so you can compare foods.

Thank You Princess 21, I'm just checking this now! I am now using a natural chicken and vegetable and also a natural product with salmon, and beef. She has been fine since I got her off of Canidae! Thanks for your input. I hated to see our girl suffer so much!

Thanks huntermom! I'll check this out too

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.