After so many product tests, I finally found something that is effective against ticks !!! Since then I use the collar has my dog no more ticks - or if she swims every day, there is the effect of something and I find it out one .... If it was not then bathe again the collar acts again to 100 % It is completely odorless and although I'm not really a fan of collars comes to my Bernese Mountain dog ran anything else