We recently got a new puppy (about a month ago) and bought a bag of her old food. We haven't been able to find that brand, Puppy Pro Pac, around here. We'd have to drive 2-4 hours to go get a new bag which we don't have time to do. We have no choice but to switch her... and she ran completely out of Pro Pac. We got her one with similar ingredients, but the kibbles are smaller. Yesterday, she ate a bit to quickly, and it wasn't pretty. This morning I gave her a little at a time and she seems fine. Is there anything we can do to help her adjust better? Thanks.