My  3 year old lab-mix (apx. 54 lbs) had a severe/life-threatening reaction to Hartz  4in1 topical flea meds last summer, possibly complicated by some dead Girardia  cells that were the only thing found in her blood/stool test.  Her heart slowed  and she was horribly lethargic for months.  It was the first time I had used it  because we were going camping and wanted protection from  fleas and ticks.  She is fine now, but the vet told me to switch to vet-supplied  Frontline as he was convinced it was the Hartz.  I did so and  she began shaking her head within a day (which was her initial reaction to the  Hartz).  I bathed her as fast as I could and gave her Benedryl for a week.  She  never seemed to get sick, but the head shaking continues 3 weeks later.   
We  are going up north on June 5th and I don’t know what  to do.  I have researched essential oils and it seems  that 
Lavendar, Lemon Grass  and  Geranium essential oils between the shoulder blades was most recommended.  My  questions are:
1.      Do they work  for fleas and ticks (lymes disease being my big  concern)
2.      How and how  much should I apply
3.      Will bees be  attracted to the smell, as she is allergic to those  too.
Thank you for any assistance you can  offer.

Your biggest concern, is that she is having neurological problems because you are giving her chemicals. All chemicals are neurotoxins and very dangerous. You can give her a homeopathic remedy called Nux Vomica 30c. This would help pull out some of these toxins. Think about building her immune system and she will not attract fleas. Oils would be fine. You can put about 16 drops into a spray bottle and spray on her. But, please remember, these chemicals are still in her body and your main focus should be to remove them.
parislivery@dslextreme.com