I think you are thinking of a chiropractor. DO’s are legitimately the same as an MD in practice. My experience working in an office with two MDs and two DOs was the DOs tend to be more personable, and the MDs feel more book smart. But they both see the same patients and do the same job in the same office.

And keep in mind my experience was just with 4 total people, so it could be just that office.