The Association for Pet Obesity Prevention tested a variety of fitness and weight-loss products for pets and listed the following as among its favorites:

• The Dog Tornado, which is an interactive food game that has four layers with rotating discs, and three of these layers have compartments for hiding snacks;

• The  Brake-Fast Dog Bowl , which has three columns in the middle that magically make a half-cup of food appear more abundant and also takes a dog a little longer to eat; and

• The  Liver Biscotti , which is a dog treat with less than 1 calorie per piece.