I use frontline plus on Reyna...we went camping and she came back with flea's AND ticks...right away we went to the vet and they gave me Frontline for her....within a few hours the flea's and ticks were dried out and fell off. No problems ever since...we still use it even though she is inside ALL day...I don't want to take any chances when we go out for walks.
But waste no time...get ur doggie on something...the situation only gets worse with flea's!
Good luck!