Has anyone heard of a German language opera/folk song about "a little mouse getting its tail caught in the door"?

People I know recently attended a small German concert (<100?), where an American women sang a song about "a little mouse worrying about getting its tail caught the door," in German. The Germans present were both horrified and amused.

Later these people I know were told that this song was both "most obscene and anti-Semitic."

Would anyone know of this song [opera or folk] and have a copy of the lyrics - to be used to inform this woman of her faux pas?