Does anyone use flea and tick medicine? The vet gave me K9 Advantix. I've used it twice and have not seen any ticks on him. He did have one in February. I hate those things. But that is so expensive. I got a 6 month supply from Ebay pretty cheap, but I'm going to need more, he is going to be too heavy to use it all. It figures. It's good up to 55 pounds, right now he weighs 52 pounds. That's just my luck.