"All that year the animals worked like slaves" p. 73
"Limped like a wounded animal."
The car lurched forward like a startled animal.
On page 154 " He began to pace back and forth like an animal in a cage..." this is a simile you can use.
In the past people used horses to complete hard work. The term "work horse" or the simile "worked like a horse" came from that. Sled dogs work extremely hard in tough terrains; hence, "worked like a dog" became an expression. You could try playing with images and various meanings, such as:She worked like a bee as if she could become the queen bee.He worked like an ant trying to climb the corporate ladder.He finished off the meal like a swarm of termites devouring their favorite wood.
Sloth?
A simile.
A metaphor
it is kitten
As proud as a peacock.
no it is not a simile
Yes, if it has "like" or "as," it is a simile.