Deliver total flea protection to your ferret with Advantage II Ferret. This vet-recommended topical treatment and prevention formula kills adult fleas flea larvae and flea eggs on contact within 12 hours of application - meaning fleas can be eliminated before they bite or lay new eggs. Effectively break the flea life cycle control existing flea and lice infestations and prevent further infestations with one simple application. Advantage II Ferret flea protection is effective on both indoor and outdoor ferrets. Your ferret should be at least 10 weeks old to use Advantage II Ferret.