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A. You need to treat your dog with a good flea product, which are usually prescription only and therefore are available from your vet. These are much more effective than the ones that you can get over the counter.
Most of the products require the flea to either come into contact with the skin or actually bite the animal and then they will be killed within 2-24 hours. So, don't be surprised if you still see a few fleas but you can be assured that they will die quickly.
If you have to buy an over the counter medication, some countries can sell regular frontline. This is probably one of the best out of the over the counter ones but is still not as good as the prescription ones. The main difference is that it doesn't sterilize the flea after biting, which means that they can still lay fertile eggs before dying and you will have the same infestation, if not worse a few weeks later.
Most of the products require monthly application to control the fleas effectively. If you live in a mild or warm climate you need to apply year round. If you have cold winters fleas aren't generally a problem during this time, so you may be able to stop using the products over these cold months. If you are unsure if fleas are a year round problem in your area, ask your local vet. If fleas are a big problem with your pet it is advisable to treat the house as well.
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