Answer:
You will be able to see most worms in the stool or on the rabbits butt. Others will take a vet to detect and to get rid of. The ones in the stool can be treated with cat dewormer. Be very careful about giving anything to a rabbit that is made for a cat -- some products are safe, but many are toxic to rabbits, and unless you know the exact, specific difference, you may be endangering your rabbit! If you don't have experience treating rabbits for worms, take your rabbit to the vet the first time so that you don't make a deadly mistake.