The characters literally combine to mean “draw a tiger, resemble a dog.” The power of the idiom comes from the stark contrast between the intended subject (the mighty tiger) and the actual result (the common dog), perfectly illustrating a failed and laughable attempt at greatness.
The origin of this idiom dates back to the Eastern Han Dynasty, in the Book of the Later Han (《后汉书·马援传》). The famous general Ma Yuan (马援) wrote a letter to his nephews, cautioning them against blindly imitating two contemporary heroes. He warned that if they tried to imitate the righteous and principled Du Jiliang but failed, they would at least still be a “cautious and good person,” which he compared to “carving a swan and ending up with a duck” (刻鹄不成尚类鹜) — a failure, but not a disaster. However, if they tried to imitate the bold and charismatic Long Bo Gao but failed, they would become frivolous and uncontrollable, a situation he described as “drawing a tiger and ending up with a dog” (画虎不成反类犬). This would be a total failure, turning them into a laughingstock. This story embeds the idiom with a deep cultural warning about the importance of self-awareness (自知之明, zì zhī zhī míng) and humility. It teaches that one should not blindly copy role models without understanding one's own character and capabilities. A Western concept like “a poor man's version” or “a dollar-store knockoff” is similar, but `画虎类犬` is more active and critical. It doesn't just describe an inferior product; it describes the act of a failed, high-minded attempt. It focuses on the folly and ambition of the creator, not just the cheapness of the result, making the critique sharper and more personal.
`画虎类犬` is almost always used with a negative and critical connotation. It is considered a literary idiom but is understood by most educated speakers.
The tone is generally formal and carries a sense of disappointment or derision at the failed attempt.