While worms in cats are known to be parasitic for the cats, their presences in the body of the cats are mostly unavoidable. The most difficult to avoid is the roundworms. In fact, this is the most common cat worms. You can easily spot their presence in the stools of your cat. They will be looked like very thin spaghetti. To treat a cat that contracted this type of worm, you can do it easily from with the liquid roundworm medication. This medication is cheap and easy to administer. The ideal treatment is one treatment in 10 days to break the reproduction of the worms.