The expression "dog playing rogue" is not a standard Chinese expression, but may be an expression in colloquial or slang. Literally understood, "dog" may be a derogatory word here, used to describe some kind of unpopular or unethical behavior; "scam" and "rascal" both mean dishonesty and untrustworthiness. .

Taken together, "a dog is a scoundrel" may describe someone or an animal (especially a dog) who behaves very dishonestly and untrustworthy. , or use some unfair means to achieve their own goals. This expression may be exaggerated or sarcastic and is used to emphasize that someone's behavior is unethical or undesirable.

However, since this word is not a standard Chinese expression, its specific meaning may vary depending on region, culture and context. In order to understand its meaning more accurately, it is best to analyze it in conjunction with specific context and background.