I've read a couple posts by Francl27 where she says she rotates dog food to avoid long-term nutrition deficiencies. (Francl27, if you're male, please excuse my use of the "she" pronoun)
I'd love to have people comment on the pros and cons of such a diet and whether those pros outweigh the cons.
I'm guessing pros are: Less chance of developing a food allergy; less food boredom; better chance of an overall balanced nutrition.
And I'm assuming the cons are: chance of stomach upset, especially if transitioned too quickly; if stomach upset occurs, not knowing if it was the transition process or something in the food that makes the dog ill; buying a bag of food the dog doesn't like; local availability of several good quality dog foods.
FYI, I've been feeding my border collie pup Nutro Ultra Large Breed Puppy Food because it rates well, has a good protein/calcium/phosphorous content, is not grain free, is affordable, and is available locally in PetSmart. I do worry that I'm upsetting the good nutrition balance with her mostly protein-based training treats (baked chicken, hot dogs, freeze-dried liver, Rachel Ray chicken "Roasters") and the frozen chicken wing that I give her three to four days a week.