Hello Joan,I mix my oils at a 2-3% blend for my dog as she has quite a good sense of smell, that's what you get with working dogs like Jack Russels (as well as a lot of cheek!). ย In a spray that's 30 drops to 8ounces of water/cider vinegar.I use Lavender, Chamomile, Geranium & Rosemary, sometimes as a compress. ย I have also used tea-tree and eucalyptus combed through her fur when I haven't been able to get to the vets for Frontline for a day or so. ย There is some fuss about animals licking the oils on their coat, but EO are much safer and less toxic than most of the flea shampoos etc that people use! ย As long as the concentration is the same as a small child and you aren't using cinnamon, mustard etc etc (i.e. stick to safe oils) then there is no problem.There is a book called Vetinary Aromatherpy, can't remember who by, although I have heard that the author is all for high dosages (I think she's French, where dosages used do tend to be higher than considered acceptable elsewhere),something I wouldn't personally risk on my pets or clients (although I will on myself!).Much love,Martin