Mix 5-10 drops of TTO in a bottle (I think they're about 3-4 oz. big?), then shake really hard, and spray on. You'll want to keep shaking it while spritzing because the oil will want to separate from the water. Start with the 5 drops, then see how it's tolerated. It's VERY strongly scented and some dogs are quite sensitive to it, so definitely go easy on it the first few times.
You could also use Neem oil for the same purpose.
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