So far I had Melaflon of Anibio and was very happy, whether drops or spray. Then I discovered Biocin with 500 ml and a little cheaper than Melafon. So I tried this because I have 3 Katzis and a doggy (small). But unfortunately I have to say that this spray does not work, neither Katz nor in dogs. All were a bit, so really not badly infested with fleas and I'm so sprayed as indicated. Effect nil. It cavort still 1-2 of these guys on my. I am going to use it, although until it all is, but at the same time ordered Meloflon again. I would not buy it!