I use Advantyx on Roxie. It works for a month and it's waterproof. We've had problems in the past and started using this product and it got rid of them. One year a long time back our cats had such a problem (we live by the river) we even had fleas in our artificial Christmas tree. It was devastating. Got Advantage from the vet and always use it now and haven't had problems since. You just have to remember to use it once a month. |