your old cat
You say he vomits in chunks... I suspect there are still chunks of undigested food in the vomit... Perhaps it's too hard for his old self to masticate properly so it all comes back up.
Maybe if you fed him soft canned food he would have an easier time keeping it in.
Also, if you feed him hard dry food only a few times a day, he may be very hungry and gobble up too fast.
You can also try to moisten his dry food with water to soften it up.
Hope this helps, keep us posted
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