Healthline recommends adding two cups of rosemary leaves to hot water, and then leaving the combination to cool. The resulting mixture can be used as a pet rinse, soak or spray – fleas hate rosemary, as it turns out. Some say that rosemary oil spray – as well as cinnamon or peppermint – can also get rid of fleas. Just test before you douse your dog or living room, as some people and pets can be very allergic to essential oils.
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