I use K9 Advantix and I'm very dissatisfied with it. It's supposed to repel ticks but it doesn't on my dogs. Granted, we have an immense tick problem here and several different types of ticks but the stuff doesn't even kill the ticks that latch on. Have been using it for three months now and last time was put on just 2 weeks ago and haven't seen any decrease in tick numbers on my dogs. Poor Jazz is just covered And I keep them out of water overnight when I put it on them. It isn't expired btw and seems to work fine for fleas. It seems to work better for the smooth coated dogs but they still have ticks, just not so many. Poor Jazz, a Great Pyr looks like I don't use anything on her I am going to get the Preventic collars but saving up the money right now. What spot on are you using?