I bought at a German mail-order pharmacy that Seresto our Elo (longhair with a lot of fur). In the first 14 days brought our dog so some living ticks into the house. Then all was quiet, but after 3 months he had a firmly clenched tick belly sitting. In between, he also had fleas, a few times he was bitten by them.
The compatibility of the collar was good, the action against ticks mediocre but against fleas is not good. Apparently, the agents distribute from the collar is not so completely in the dog's skin. Will not buy it again.
