Hi, If one cat in the household (outdoors) has tapeworm do I need to treat my other two indoor 6 month old cats? I’ve just treated them all with stronghold which doesn’t of course cover tapes. I usually do tapes every 3 months for my outdoor cat but am going to have to up this as this is the second time I’ve seen her with them in less than 6 months. Last time I wasn’t sure. This time I’m 90% sure.