I use Repel spray and Repel essential oil from onlynaturalpet.com. It has neem oil, citronella and other essential oils. I like it so much I use it on myself. I spray the dogs' bellies and legs then use the repel oil between their shoulder blades and on their butt. I put a few drops of the oil on my hands and wipe it carefully around their head. It works like a charm for me and the dogs.
Margaret Jezek, Charlee and Wrangler