[Idiom] To be at it like a dog.

[va.ma]

Hello everyone,
I'm translating into italian some dialogues, and I'am not sure about this expression:

A:How was your day?
B: I've been at it like a dog all day. I'm utterly broken.

What does it mean, to be at it like a dog?

Thanks

 

[billmcd]

Hello everyone,
I'm translating into italian some dialogues, and I'am not sure about this expression:

A:How was your day?
B: I've been at it like a dog all day. I'm utterly broken.

What does it mean, to be at it like a dog?

Thanks

Working hard. Thus the common expression in AmE, "I've been working non-stop all day. I am dog-tired".

 

[va.ma]

Working hard. Thus the common expression in AmE, "I've been working non-stop all day. I am dog-tired".

Thank you so much, it's all clear