I didn't see them in Tibby, but they are supposed to be about the size of a grain of rice. And if you can, it wouldn't hurt to bring in samples of all three cats, it's a good thing to get done every once in a while. If you can't afford to get that done, take them into the petsmart shot clinic (if your local petsmart does that) and get them dewormed a Drontal dewormer (that gets rid of tapeworms) will be either $11.52 or $14.99 depending on the size of your cats. They also have a dewormer that gets rid of round & hookworms which costs $8.00 per cat.