Have just re-read your orignal question, and I must have been having a senior moment, as I thought you were asking about cutting down from 4 to 3 meals! I would definitely keep her on 3 meals until she is at least six months, then you could do as I suggested above and cut out one of the meals and end up giving her a breakfast and teatime meal, with maybe a bikkie snack in between and at bedtime. Some people keep their adult dogs on two meals a day, mine all have one meal in the evening but there is always a bowl of dry food down for them to pick at if they are hungry during the day, but they are not Labs! LOL