Why are dog butts just holes?

Will wants to know, why are dog butts just holes? Why don't they have butts like we do? Dr. Danger and Super Eddie discuss butts and butt muscles. Dr. Danger explains how two-legged animals need different muscles than four-legged animals. She also shares some interesting biological terms related to butts.  Thanks for the question, Will!  Get Dr. Danger's new book, Meet the Trees.  Connect with us on Facebook or Instagram @DrDangerScience.  Submit a question to the podcast here.  Get full access to Dr. Danger Science at emilydangremond.substack.com/subscribe