Does anyone have knowledge about which essential oils applied (diluted, of course) externally to repel fleas & ticks are safe for use on Greyhounds? I perused the internet & only found that cedar oil should not be used on Greys, as it's way too potent & potentially poisonous to them. Also, is it risky if the essential oil sprayed on their coat & feet are licked after it has dried or soaked in? Last summer I started using a spray product made by Kin + Kind to repel ticks & fleas, which seemed to work well. The active ingredients include the following essential oils: peppermint, cinnamon, rosemary, & thyme. Honestly, it didn't occur to me before that there may be some essential oils that are contraindicated for use on Greys. Our Girls don't like being sprayed with anything, but I don't want to use poison & chemicals on or in them when there are safe, natural alternatives. Anyone have experience with external use of essential oils on Greys? Thank you!