I treated my dog for fleas and it didn't do anything?

Hi there, Frontline is very good, as is Stronghold. Make and immediate emergency appointment with your vet and get your dog weighed to ensure the correct dosage. The weight of your dog will require either more/less than another to kill fleas/larvae and mites, and to check there is no other skin problem occuring. Some dogs can become allergic to fleas and this can create a whole host of skin issues. Good luck!