I have this same problem with Brennan. If he doesn't have something to chew, he destroys stuff (like eating half a flip flop ) then he of course vomits that back up. It's hard to find stuff for them to chew that lasts long (he can eat any kind of chew in an hour or less usually!)...

Someone told me to try bully sticks, they are supposed to last longer and are supposed to be very safe. Maybe you could try those for Clover?