The poem was written by Carl Sandburg, which is written in 25 words and is about the fog which arrives in Chicago.
The poet compares the fog with a kitten because kitten who has soft paws and without even giving any notice, similarly the fog is soft and it also comes in the same way. It tells that fog does not stay in the same place for a longer period of time.
It stays at one place for a shorter period of time and then moves on. It also tells that the fog can also be very harm ful some times. The poet says that the accidents occur due to fog and people cannot see what is happening.
The fog just sits there quietly and sees what is going on around just like kitten. Fog is a poem that wonderfully captures a moment or two when the fog comes moving as a powerful image through a metaphorical cat.