Cats are not regular exercisers. Dogs usually love to go for a walk. Cats not so much. The old saying that dogs have masters and cats have servants often comes into the causes of your cat putting on weight. As humans, obesity can easily occur if you lead a sedentary cat lifestyle and eat a lot of high-calorie dry cat food. Cats are hunters. they do this when they are hungry. Hunger drives activity and activity burns off calories. You will never see a fat lion or a fat tiger. Feed raw, red and fresh meat that your small tiger wants to attack with vigor and do not leave large amounts of dry kibble/biscuits on the floor for your cat to “graze” like a cow.