When you hear hoofbeats think horses, not zebras. It's one of the basic tenets of veterinary medicine (and, for all I know, human medicine too).

It depends upon how long they've been practicing human medicine. Sometimes new doctors go looking for zebras first.

Last year, when quietann went in for a diagnostic procedure, I gave her a small stuffed zebra to bring with her. I don't know if it helped, but the doctor didn't find any other zebras.