I don't use Frontline but the product I use says up to 10 lb. My girls are 4 and 6 lb so I only give them 1/2 a dose. But I just don't know with Frontline. In my area, Frontline has become ineffective so my vet isn't even selling it anymore. Maybe ask your vet about the possible dosage? Up to 22 lb, in my opinion, is a broad range. Hopefully someone here who uses Frontline can give you more information. |