Read the excerpt from The Call of the Wild.

They were simply so many bags of bones in which sparks of life fluttered faintly. When a halt was made, they dropped down in the traces like dead dogs, and the spark dimmed and paled and seemed to go out. And when the club or whip fell upon them, the spark fluttered feebly up, and they tottered to their feet and staggered on.

The descriptive language in this excerpt help readers to visualize

how determined the dogs are.
how exhausted the dogs are.
how devoted the dogs are.
how confused the dogs are.