dog-tired 极度疲乏；累极了

【例句】
By dusk we were dog-tired and heading for home.
到了傍晚我们累趴下了，于是回家。

He usually got home at around seven o'clock, dog-tired after a long day in the office.
上了一天的班快要累成狗了，他一般7点钟左右才到家。