So, there is not an point in testing the toxicity involving a product on an animal's skin area.
Try warming up some oil and massaging it in the scalp, let it sit in for a minute or thereabouts and then shampoo as usual. Spend some time to find one that is best for your family. https://Medium.com/@cbdskincare1_66997/achieve-radiant-skin-with-these-plant-based-tips-c0d6b697fdd2