Speaking of animal shampoo, me and the wife rescued some pups and they had issues...
Too young for flea/tick shampoo, but we found a hippy organic shampoo that just smelled like the best of the fall season. Took care of the fleas/ticks, and we kept it around for general dog bathing for the smell. It was amazing, lol.
That's the brand I used for years. I've since went bald, but my buddy has a full head of hair with a man bun and swears by it.