Neem for Dog Lice
I've read here that Neem is effective on biting and chewing insects, so that may apply to dog lice. I have in the past made a neem shampoo using regular dog shampoo with 1 ounce per gallon of Neem oil. I would think the shampoo would emulsify the Neem oil, but I also use a bit of dish detergent to mix first before adding to the shampoo.
Is Neem oil also effective as a wash for baseboards or concrete where lice might hide in corners. If so, what percentage?