Of course, next to a tiger a dog doesn't look half so impressive, and in the expression "trying to draw a tiger and ending up with the likeness of a dog" (wildly overestimating one's own abilities) the dog becomes an object of ridicule.
當然，狗見了老虎，威風減了一半，有一句話說：「畫虎不成反類犬」，表示虎畫不好就像條狗，狗在這裡反成了諷刺的對象。