Hey Mary,
Have you tried mixing some KMR liquid with canned kitten food? That'll put meat on his bones. That's what I do for my 16 year old cat Murphy. She is bone thin but has an appetite like a horse. I attribute her thinness to her thyroid. Before I adopted her from the Ct Humane Society, she had her right thyroid nodule removed. She's a little spunky, even at the tender age of 16. I'll give her whatever food/KMR mix is left over from little Molly. She noshes on it throughout the day.
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