Bella came to me on purina (I think) from the breeder. The vet wanted her to be on Science Diet and I didn't know about YT yet, or doing food research. So she was on SD for long enough for me to gradually switch her to Natural Balance which I would rotate her.
She started to get bored with NB and seemed to pick up some weight on NB so I switched her to Orijen and has lost a few ounces. I didn't mind if she was a teapot, as long as she was healthy was the most important to me.
Anyway, as soon as I put the Orijen in her dish, she would flick the NB discs out of her food dish and go for the new food. She loves it and bc it is so high in protein she eats less and seems to be happier.
So now she is on Orijen, and she will be rotated with Fromm, Taste of the Wild and possibly Eagle Pack (I think) Holistic. I'm going for the grain free varieties.