1. Don't be such a dirty dog; you promised to keep it a secret.
别这么卑鄙，你答应过会保守秘密的。

2. He is a real dirty dog for betraying his own teammates.
他背叛自己的队友，真是个卑鄙小人。

A: I can't believe he stole the idea from his colleague!
A：我不敢相信他竟然偷走了同事的主意！

B: What a dirty dog! He is completely untrustworthy.
B：真是个卑鄙小人！他完全不可信。

1) 卑鄙小人

2) 耍手段的人

3) 不诚实的人

1. 卑鄙小人

e.g.
He acted like a dirty dog during the negotiation.
他在谈判过程中表现得非常卑鄙。

noun phrase

1. A person who is dishonest, contemptible, or mean-spirited.

Synonym: scoundrel, rogue, villain