ApocaTip: I figured it out! I mean, this dog did, but now we can all squish under things like Cat and surprise HER if we practice his army crawl. It is called that because you have to use your arms to pull yourself along. Wait? Do dogs have arms? Should it be called a “leggy crawl?”
PS – Love A Pet at Northeast Animal Shelter helped find this dog a home, but maybe they have other dogs who can teach you useful things. You should check!