Advantage can be applied as often as every two weeks. Also advantage does not repel fleas. You want fleas to jump on your animals so as soon as they start to walk on her they will start to die. You may have a bad infestion in your house I would give her another dose if it has been two weeks. Also you really don't need to use any other flea products as long as you are using Advantage.
Wendy@newyorkies.net