Pamela gave you great info. I’ll add to it by saying that rotational diet means different things to different people. Some people rotate proteins within the same brand (like you were talking about), others switch not only the protein, but the brand like myself and Pamela do.
Switching within the same line, you don’t need to blend food. The only reason they SHOULD get GI upset is if they were intolerant to an ingredient in the food. Other than that they should be fine.
How I started my pitbull on a rotational diet was, I added Kefir (very popular milk type drink in the Jewish community that contains strains of healthy bacteria which allows dogs to digest different foods) to his food for the 7-10 day window where you would be tranistioning foods. I also added a digestive supplement from The Honest Kitchen called Perfect Form. I did this for a few switches, however now, I no longer have to do that. I can switch every meal to a new food (I don’t except for some samples of different foods here and there) without GI upset. Veterinary Nutritionists like Dr. Susan Wrynn are even recommending rotational feeding to make sure your dog is not nutritionally defeciant in anything on just one food.
My experience with rotational feeding has been fun and it’s made my dog interested in food again. I used to feed lots of different brands, however now, because of skin conditions he has I need to feed 1-2 foods to see if the food is making a difference or not. Thats just my situtation though. If your dog is completely healthy I think rotational feeding is excellent.
