Fleas are prolific and most of the natural flea repellants just don't work.  So out of frustration pet parents turn to spot on or medicinal flea products which compromise the health of your pet and your family.  Poison is poison - it may kill fleas but it's also threatening to your pet's well being.
Shoo Tags(tm) are lightweight plastic tags your pets wear on their collars.  They have a magnetic strip like credit cards and this emanates a magnetic energy field that basically binds to your pets natural energy field and fleas are repelled because they don't recognize your dog or cat as a potential host.  This company also makes tags for people for repelling mosquitoes.
Feeding garlic (freshly minced) on a continual basis is a sure fire cure to your flea problem.  Start with a small amount - it MUST be fed daily - and build up gradually until your fleas are gone.   It takes just about 8 days for this formula to kick in, so if you still see fleas in eight days increase the dose slightly.  Mind you . . . it only takes about 3 days of not feeding the garlic for the effect to wear off - so consistency is your natural solution.
Lastly - applying food grade diatomaceous earth to your dog will kill both fleas and eggs by causing micro scratches in the chitin shell surrounding their body or that of the egg.  They then dehydrate and die.  This is messy - your house will get powdery looking.  You need to be careful not to put too much because you don't want your dog inhaling the powder and risk irritating the respiratory tract.