@jerry Once took my dog to vet because he was gnawing the base of his tail. I swore to her he didn’t have fleas.
She took a few minutes, looking around his rear, and very quickly pulled out a flea.
I apologized and get stuff to handle the fleas.
(I really didn’t think he had fleas. I’ve been in flea-infested situations before, and thought I knew what they looked like. I was wrong.)