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Step 1
Try changing to another cat food if your cat isn't eating enough. Pets, just like children, can be finicky eaters. A simple change in food could get your cat to eat more, thus causing the cat to gain weight.
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Step 2
Keep your cat's food out all day. Unlike dogs, it can be extremely difficult to get your cat to adhere to an eating schedule. Leaving your cat's food out all the time will allow your cat to eat when he is ready.
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Step 3
Add canned cat food to your cat's dry food. Many cats prefer the canned foods to dry food. If you put the canned food over the dry food, though, your cat will eat both. This will increase the amount of calories in your cat's daily diet, making your cat gain weight.
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Step 4
Pour a small amount of olive oil over your cat's food. A tablespoon should be a good amount, but you can just eyeball it when pouring the oil on the food. Olive oil may make the cat food more appetizing for your finicky feline, which in turn will lead to him eating more food than normal. As two added bonuses, olive oil can also improve the look of your cat's fur and help to eliminate hairballs.
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Step 5
Give your cat milk a couple of times each day. Since you want your cat to gain weight, you should give him or her whole milk. If your cat doesn't love milk, you can mix the milk with half and half. Give about 1 cup of milk to your cat once in the morning and once in the evening. If you give your cat anymore milk than that, he may get an upset stomach.
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Step 6
Ask your vet about a dietary supplement or high-calorie food. These items are made specifically for cats who are dangerously underweight or who haven't been eating regular cat food. While you can order these items on your own (see Resources), you should still contact your vet first to make sure that a supplement or high-calorie food is necessary for your cat.
