Nope, Graham. As an ex vet nurse, I can tell you that the over the counter products do not work as well as those sold at the vet's. That goes for wormers and all sorts of other treatments. You will see Frontline sold at chemists now. It is because fleas have become resistant to it. Frontline have brought out a new one but, guess what, you can only get it from the vet.
I, and another vet nurse, are trialling our own system - I have to preface it by saying that we do not have an existing flea problem.
We are treating the house with the spray that kills the eggs and larvae. The one I use is Indorex. That is available without prescription. It lasts a year! You have to spray it into every little nook and cranny everywhere. Vacuum well before you start to pick up any eggs in the carpet.
Dog fleas (well cat fleas really because dog fleas are rare) live and breed in the environment. They jump on the dog or cat to feed and then jump off to hide and breed in the cracks and crevices around the house. If you can interrupt that life cycle then you stand a good chance of see the blighters off. It is working so far! We both do not have cats in the house. This is quite important as cats are a major source of fleas entering the house and our system may not be strong enough to cope with constant invasions from indoor cats picking fresh fleas up outside.
If my dog was to get fleas on her then I would shoot off to the vet for some treatment as you don't want them to get a foot in the door (or on the dog
I have been doing this for some months. I did have a hiccough when my dog went to a friends house and picked up fleas there so that is the risk you take. I have pleaded with my friend to treat her house but she continues to buy stuff cheap from the pet shop. She believes that flea combs and such things work. If she had seen what I have seen she would rush out and get the proper treatment for her dogs straight away. I have never done the monthly treatments anyway because we don't have a cat now and think that it is a bit over the top for our situation. Cats will leave flea eggs in people's gardens though. Again we rarely see a visiting cat and those that do visit may well be treated