I use with my hounds Frontline for more than a decade and have always been very satisfied.
I can recommend to give this means on the 1st of every month (even in winter) right out of the pipette on the skin of the dog on the spine. Take the little tuft of hair aside and distribute the contents of the pipette over 5 or 6 points up to the neck. It is important that the dog after a few hours does not get wet, so dropping the most just evening. Sometimes I forget the 1st of the month and then realize that the dogs increasingly have 14 days later ticks on the body. The agent's really effective and will last about 4 weeks. In extreme cases (long water work the dogs, high tick density in the forest) I pudere Floo powder after. The I distribute all over the dog early in the morning so that he can get rid of the white cloud during the day. Some ticks we always catch the dog, with or without frontline, but the average is considerably less ticks and fleas, and they also appear to be less resistant, because with a tick remover fall the animals out very easily.
For me Frontline belongs to dogs hygiene as annual vaccinations and the 1/4-annual deworming. Frontline saves a lot of work in the tick search, save the dog suffering and eternal scratching and is therefore indispensable for me!