Hi! My little big girl, Sookie, is 7 months now... When should I be changing her from puppy to adult food? Right now I have her on Adult Large Breed Science Diet (the pet store said it is fine).. but I'm not sure it was the right time for her to be moved to adult food.. And I'm thinking of changing brands too, to the Blue Buffalo? Is that a good brand. I noticed that the first ingredient is an actual protein and not a grain. Any help would be appreciated!