Fleas can be nasty to get rid of. However, you may want to switch from frontline to another brand. When Rocco was a puppy he had the same issue, I was using Advantage and he still got fleas. I switched to frontline and it worked for him. My vet at the time said that some brands work better with different dogs. You may want to ask your vet about using another brand like Advantage or K9 Advantix. Once I switched Rocco he has not had any others problems with fleas.

Kelly