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Actually I do know what my parents feed the cats. Those kibbles you see there are just for between-meal snacks. They get wet food in the morning and an 1/8 can of wet food (each) at night. The food has been dosed with Metamucil. It is usually warmed in the microwave before being fed to them.
That, coupled with the low-stress environment of the retirement community, makes for a nice kitty-coat.