“hork up hair balls”
Hair balls are a normal part of everyday life in my house. Also, regular vomit from one or the other of them. Since mine are all indoor cats, there is no shortage of puke and hair balls to clean up.
Plain brown dry food.
Freshen water regularly.
A little butter or a Tablespoon of bacon grease or olive oil once a month or so keeps the hairballs away.
Puking is a sign their food isn’t agreeing with them. - Also, brush them every once in a while to get rid of excess hair; otherwise they lick the hair off & injest it.