our baby girl suffers from flea allergy too.. we front lined the end of august around 24th but by 5th Sept her back was near bare and she had sore red blotches on her stomach.. with no fleas to be seen!!! our vet prescribed stronghold flea treatment and some meds a week later her red sore spots were gone.. we usualy have to repeat a few times especialy during summer
the problem with most flea treatment is that they have to actualy bite our babbies in order for the treatment to kill the fleas.. which for a dog with flea alergies is bad news as one bite is all it takes to cause sevear reactions
if you have a dog with a flea allergy you really need to stay on top of it or your dog may well literally rip hair out in no time at all.. we have 3 yorkies and she is the only one who reacts soo soo bad
between flea treatments we shampoo with medicated tea tree and lavender .. you also need to be aware of areas you walk your dog, fleas live in long grass.. and places frequented by other dogs
we also ripped out all our carpets last summer from our home and replaced with hard flooring and hoover daily
good luck ..would luv to know what others do for flea alergies so will keep an eye on your thread