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It's because of the food they eat.

Inside cats are fed cat food, and cat food usually makes a cat gain more weight because some of the cat food ingredients.

Now, a outside cat doesn't eat cat food. A outside cat eats stuff like mice and birds. Mice and birds don't have the ingredients cat food does. And outside cats have to hunt the mice and birds, and sometimes the cats don't catch the mice or birds. Sometimes it catches somthing sucessfully and sometimes it doesn't.

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15y ago

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