I just got a letter from my Vet hospital today ( under new management ), that all feline indoors and outdoors should have a yearly round parasites preventative measure, which can be done by applying a broad spectrum preventative applied to the back of the neck once a month, which protects the cat and humans as well. This is new to me and I'm not sure this is just a way of drumming up business since the hospital is under new management, what do you guys think?, I have one indoor cat, thanks.