"Fog" is a very short poem by the American poet Carl Sandburg, published in 1916 in Sandburg's first major poetry collection, Chicago Poems. In the poem, fog appears, settles over an unnamed city and harbor, and then simply disappears. The speaker compares this fog to a cat, saying that it has "little cat feet" and sits on its "silent haunches." The extended metaphor comparing the fog to a cat makes nature seem more mysterious and alive. Overall, the poem is an important example of the memorable, imaginative, and approachable style that earned Sandburg such popularity and influence during his lifetime and beyond.