I dabble in therapeutic essential oils and I have that mix. We tend to get lots of hitchhikers in the hills by our house. Spraying her before a hike has helped. Otherwise they catch a ride on Siena then fall off and crawl on the humans. Yuck! So, yes, I believe it would work just fine. The only thing I do different is the water. I would use a base of coconut or similar oil and put it all in a spray bottle.
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Diana - owned by Siena Rose (Oct 29, 2006 'Kiena vom Nadelhaus')
http://www.dogster.com/dogs/476646