There could be something wrong with the new food. What is the new food that you are trying to switch him to and what is the old food?
If it's the Kaytee with the colorful bits or seeds in it, that could be your problem as they can add too many carbs in the diet. Or it could be that the feed is contaminated in some way(which can be very bad) and it's causing the digestive upset.
I would suggest trying a different feed that is just plain pellets. There are other pet store brands out there like Oxbow, Sherwood, etc. Or you could find the brand of the old pellets and get those. Nutrena and Purina are bulk rabbit feeds sold at livestock feed stores. They aren't as high quality as some of the pet store brands, and you usually have to buy a 20 or 40 lb bag, but it sounds like they would be a better option than the kaytee if you can't get or afford the better pet store brands, and if the kaytee pellets are the cause of the digestive issues you are seeing.
If you happen to have started a new bag or bale of hay, you'll want to check to make sure it's not spoiled and the cause of the digestive issues instead of the new kaytee pellets.
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