work like a dog

to work very hard; to work like a beaver

"I became an investment banker after college, and now I work like a dog."

"I'm too old to work like a dog"

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working like a dog

Sacked out on the sofa all day.

"Man, I've been working like a dog", he muttered into the phone, his feet up, eyes on the game, the bag of Doritos on his chest almost empty. There must have been a time, long ago, he imagined, when dogs spent their lives herding cattle from sunrise to sunset, but any actual 21st century dog he knew was lazier than The Dude.

Work like a dog

To work like a dog means to do regular work on the Sabbath.

Please do not work like a dog on God's holy Sabbath.