First of all, take a deep breath. Fleas are part of owning a pet. Even if you succeed in getting rid of them when you see them, they�ll be back, so it�s important not to panic. Fleas are everywhere you take your dog. They latch on to people and animals in the hope of being carried and fed.
Your dog is young, so take the time to find a treatment that works for you and it will become part of your pet-care routine.
Let�s start at the beginning. Fleas hide, so you won�t always spot them. I find it easier to find their droppings. Lay an old towel on the floor and spray it with water (like a demister) until it�s just damp. Stand your dog on the towel and comb or brush it. Flea droppings are mainly digested blood, so as soon as they hit the damp surface they will spread out and look like blood specs. You might get lucky and disturb a flea too, in which case seize it and squash it immediately. Two things from personal experience. Firstly if you try and get a good look at it it will escape and secondly you will have to squeeze very hard to kill it as it has a hard shell!
Now you need to treat the dog. Personally I favour Frontline which I see no-one else has mentioned. It�s thorough and predictable. It can also be purchased online for less than a vet charges. Most important it is not traumatic for your dog. It is like a syrup and all you do is part the fur on the back of your dog�s neck and squeeze the dose on. As your dog grows up it might grow its own resistance to fleas, so rather than just dose it up, wait until you find fleas again before repeating the dose.
This site will help you find treatments online, but also google frontline to take you to a variety of pet care sites.
http://www.petvetcare.co.uk/acatalog/Frontline _For_Dogs.html
Hope you have many happy years with your