I have fed Toki each of the grain-free Fromm formulas...it is definitely my top pick and a favorite here (especially the Game Bird formula for us)
My sister feeds her yorkie the grain-free Acana Regionals which has a comparable protein % to GF Fromm (~30%). And I know that Natural Balance has some grain-free formulas (their Alpha line ) that are even lower in protein (~26%) if that's one of your considerations. Also if you like Go!, you might look into Now Fresh which is made by the same company but is lower in protein. I'd feel comfortable feeding any of these foods!