One of the cats threw up upstairs just recently. That's fine, they often have furballs. But this was quite not good. It was half digested food and something that looked like worms maybe. Jeter often chews on his cat tree and at first I thought they were threads from the cat tree, since they looked similar. There were about a dozen or so 'strands' that were about as thick as angel hair pasta, and were off white. They were about an inch long and had tapered ends. Heartworm? Some other worms? But there is nothing in their poo! Could this be something they ate, or are there worms that they would throw up and not poo out? I'm taking them in tomorrow to the vet, all three, but what should i ask for?