
Hiya , for protection against Ticks , Frontline Spot On has to be applied once a month even though it will protect for upto 3 months against fleas. If you read the instructions it does tell you this but it is easy to miss it ;)
Hudson had a tick when he was younger and we were using advantage , I changed to Frontline and have used it monthly ever since , no ticks :). You can get a good household flea killer to treat your house (if you find that there are fleas in the home) from the Vet ..you will need to do everywhere that the dogs go and also wash ALL the bedding etc that they use.
HTH
Melody