Our Tally started doing this very thing this past spring. She had recently lost a lot of weight, the result of her playing with our younger newest addition. We had always fed Moe and Tally one meal in the evening. Our vet thinks that Tally's new more active life-style called for more energy during the day. She suggested giving her two meals a day, instead of her usual one. She gets the same amount of food daily, but broken into two meals; two thirds in the morning and one third in the evening. Worked like a charm. Moe still got his whole meal at night but recently he began to want whatever the little guys got so they are all on the same schedule.There was a very recent thread about this that you might look for. Some dogs get upset stomachs and vomit when their stomachs are empty. Does your friend feed his or her dog twice a day or just once? She might consider giving the last meal later in the evening. Or feeding breakfast earlier.