I have posted on here several times of natural flea and tick repellent. After doing much research I found a couple of sites that give you "recipes" of different essential oils to mix together that our safe for our pets (don't think you can use them on cats) and to be used on humans as well...I mix 10 drops lemongrass oil, 10 drops peppermint oil, and 10 drops of lavender oil with 1 cup of water, Put in spray bottle, I spray and paper towel and wipe it all over the pups I also spray their harnesses with it....we haven't had any fleas OR ticks, Only draw back...where it is all natural it has to be applied every couple of days...but NO CHEMICALS!! That's the part I like,...I am going to post the 2 sites I have...hopefully they will work
Aromatherapy Recipes for Dogs | Essential Oils for Dogs Natural Ways To Get Rid Of Fleas