Here's what I would do. Do you have a scale in your house? If so, pick up Cleo and step on the scale. Then put her down and weigh yourself. Minus your weight from when the two of you were on it together and you get her weight. Jot down the weight - and do this every week. If you see an increase, do it more often and then in about 3 weeks or a month, show your father the paper and tell him what you've been doing. Tell him that the dog is constantly gaining weight and you would like him to cut back a little, unless he wants to go outside and play fetch or something with her for an hour everynight.

Your dogs calorie intake should be enough to fuel him throughout the day, it is only when the calorie or fat intake exceeds the amount of loss then the dog gains weight. Just like in humans.

If that doesn't work, just work with her more and make her play more and excersize more. Hope I've helped.