…frontline for one month?

If I had to choose between Frontline and Advantix, I'd choose the later. I used both in the past, but we got better results with Advantix. Of course, they both are more effective if you don't bath your dog too often. Unfortunately, both products only kill the fleas and their eggs/larvae, but they don't repel fleas. This means a flea can jump on your dog, and it will die only after it bites the dog. And that bite can make the dog scratch a lot, especially if he's allergic to fleas. This is my dog's case. She's allergic and she scratches a lot even if I can't see any flea on her coat. For the next flea season I intend to use Foresto (Seresto) anti-fleas collar made by Bayer. A friend recommended it, so I'll give it a try.

No matter of what anti flea product we are speaking, you shouldn't bath the dog too often, as the effect of the chemicals goes away. The producer recommend to wait at least 48 hours after you've applied Frontline before letting your dog get wet. This includes swimming, walking in the rain, and, of course, shampoo baths. My friend doesn't even let her dog outside in the rain after she applied Frontline on her dog's coat. When she must take the dog out in the rain (for her duties, you know), she puts a vest on her dog. She looks pretty funny with that rain coat on.

It might be worth investigating whether or not your dog's itching is caused by something other than fleas or tics. My dog used to scratch his ears and his side as well as rubbing his bottom and chewing his paws. We tried Frontline flea/tic treatments, washed him in specialist shampoo and gave him worming tablets -nothing worked. The vet then discovered he had a non-specific allergy known as atapy. They initially tried him on standard human issue anti-histamines but,although this helped a little, it did not clear it up fully. Therefore they issued him with some steroid tablets called Prednidale and this has really worked for him. If we mistakenly forget to give him his dose then the itching and scratching comes back again -it definitely works! However, we try and restrict his dose to the bare minimum because of steroids side effects (increased appetite etc)but we can manage his condition very well with one small tablet every other day. This might be worth considering if your dog's condition persists.