I am going through the same thing with our dog. It is from the ingestion of fleas. The egg for the tapeworm is carried inside fleas. I would think the vet will suggest treating all the furries with frontline or something related and then possibly treating all as a preventative for the tapeworms. So you may have to pill all animals for 3-5 days depending on what your vet suggests. If they are small white moving segments it is tapeworm. Artica is taking panacur. Good luck with this and keep us posted.