a dog's chance 极微小的机会；极有限的一点机会(常用于否定句)

【例句】
A failure in life doesn't mean that you just have a dog's chance.
生活中的一次失败并不意味着你就再也没有机会了。

You are confronted with a very powerful team. I'm afraid you won't have a dog's chance to win the game today.
你们今天要打的是一个很有实力的队，恐怕你们没机会赢了。