Hi croeber-
Have you seen this article in the review articles? /frequently-asked-questions/diet-rotation-for-dogs/
It lists some pros and cons of a diet rotation. I do like to change flavors of kibble frequently and also change brands occasionally as well for my dogs. I also add a variety of meal mixers in their food.
However, I have a cat with a medical condition and I stick with the same Rx kibble for him, but also add a variety of toppers to his kibble as well.
I absolutely do not think it is mandatory, especially with any health conditions or an older dog that may not tolerate it. I’d definitely take it slow if you give it a try. I no longer have to transition my dogs to a new kibble. Their tummies handle it with no problem. But, it wasn’t that way in the beginning.
Steve Brown has a download for around $3 that aids with healthy foods to mix in kibble.
Good luck with whatever you decide!
