Tics are such a pain, but luckily only one of my 3 moggies gets them. Freddie who is a very long haired tabby. I think its because he goes wandering more than the two girls, and the fact that he is long haired too. I use Frontline Combo but to be honest I dont rate it much for tics OR for fleas. I dont know whether cats build up a resistance to it, Ive been using it for years. I actually think Im just going to buy the ordinary Frontline in future as its much cheaper. In the UK do you still have to go to the vets to get it the Combo? You buy it in pharmacies over here, but it is very expensive.