“Once Bitten, Twice Shy” – Dogs and Mustard! Posted on January 21, 2013January 20, 2013 by Elephant “Once Bitten, Twice Shy.”Mary Had a Little Lamb and Other Good Stories.Henry Altemus Company: Philadelphia. 1906. A burnt dog dreads the mustard pot; However you may try To coax him, he will taste it not – Once bitten is twice shy.