The newest versions of Frontline and Advantage II have quit working. I am in TX and the fleas are back in force. I am considering a Seresto collar for the long haired cats and ordering Revolution (from the Australian site) for the short haired cats (5 total, 2 long, 3 short haired). Thoughts? Our cats are in/out with a enclosed garden that they can go sun in at will. One is a new stray (neutered and vaccinated) that will come in some, but is still fighting with current cats a lot, so he is outside way more and on the loose in the front. It will be sometime before we can acclimate him to being a inside/in the garden cat.