We want to switch our dogs to a new brand of kibble, because the old brand has apparently raised their prices. However, we only have about two full days' worth of the old food left. Would it be too quick to switch foods over three days or so? I think we have enough to do 75/25 on day one, 50/50 on day two, and 25/75 on day three. Usually we would spend 5-10 days on a switch. I'm trying to avoid buying more of the old food, but I want to make sure it won't upset their stomachs.