dog's life可不是“狗的生活”，而是“〈非正式〉悲惨的生活；潦倒的生活；穷困的生活”。

【例句】
Poor Mike, his wife leads him a dog's life with her incessant nagging.
可怜的迈克，他妻子唠叨不休，使他过着悲惨的生活。

His father's bankruptcy led him a dog's life.
他父亲的破产使他过上了困苦的生活。