Mine are all seniors
Two of them were throwing up a lot, so I stopped feeding them dry food, over a year ago. And then cut out just about all of the canned flavors except chicken. No seafood at all. The diet changes fixed the problems for those 2. Fat cat didn't have trouble, but if I feed her dry, the other 2 will eat it, because they were asleep when I explained the connection between dry food and stomach upset. I basically spend my time at home telling the cats it isn't time to eat, or feeding them. 
(nice to run into you! Hope you are ok)
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