A: If we have a pretty good handle on the type of infection (bacterial, yeast, mixed) and your ability to treat it, and if we’ve seen your pet within the past 12 months, we’ll refill. If the problem seems to be stubborn, treatments have not worked, if these infections keep recurring too quickly, or if it’s been more than 12 months since we’ve seen your pet, we’ll probably want you to make an appointment.