 The Lichtenstein foundation notes that the inspiration for this painting is a frame of Our Fighting Forces # 66 ( February 1962 ) , which was published by National Periodical Publications ( now DC Comics ) . In that frame only a portion of the dog 's head is visible and the speech balloon says " <unk> ! " In addition to the painting itself , Lichtenstein produced a small 5 @.@ 75 in × 4 @.@ 5 in ( 14 @.@ 6 cm × 11 @.@ 4 cm ) graphite on paper study . 
