Be careful with Borox - your dog can eat it and die!  (It does work on fleas - you just have to be very very very very careful how you use it.)  I suggest a flea bomb in your house - make sure all people and pets are out of the house - and wash all linens in hot water.  Also, frontline plus works best.  But do NOT wash your dog within 6 hours of putting the frontline on.  Also, don't put the frontline on right after a bath - you have to wait at least 3 hours because flea medicine sticks to the oils on your dogs' body.  Dawn dish-soap is best to wash your dog, but it is only a temporary fix.  They will come back if you dont use frontline plus or advantix.  (Flea collars are known to not work well).

we got a flea infestation once, and we did all the above and they are all gone! And my pups get frontline plus and they are flea free, too! :)