Nobody in this poem ever sees the monster, and that is the secret of how it works. The speaker's only evidence is sound: "How do I know? I've heard him there." There are no claws, no glowing eyes, no footprints, just a noise in the dark that a nervous imagination is happy to turn into a creature. Susan Zutautas's "Monster Under My Stairs" is really about that process, the way fear grows in the gap between what we hear and what we actually know, until an ordinary flight of basement steps becomes something to cross with a held breath.
The monster himself is sketched in the thinnest strokes: "He's big, he's hairy / He's very scary." It is the kind of description a child would give, short, flat and rhymed almost by reflex, and the poem's voice sounds convincingly young for that reason. The details that matter are the odd ones. The monster sneezes, and the sneeze is powerful enough to "shake the entire house." A sneeze is a comic, domestic, almost embarrassing thing, yet here it has the force of an earthquake, so the reader laughs and shivers at once. The simile "as quiet as a mouse" does quiet work too. Following the speaker's "I've heard him," it seems to describe the speaker, which makes the child small prey and the monster, by implication, a hunter. The sentence is loose enough that the monster could be the one keeping quiet, and that reading is just as good: two creatures, each hiding from the other.
Structure builds the suspense. The rhymes arrive in tidy couplets (stairs/there, mouse/house, hairy/scary, four/door), giving the poem the bounce of a skipping rhyme. The descent puts that bounce under strain. "One step, two steps, three steps, four" is almost entirely single syllables, each one a footfall, and it is hard to read quickly without feeling the plod. Then comes the question "Did the monster hear me open the door?", which arrives after the counting has begun, as if the worry has only just caught up with the speaker. The count then lurches: "five steps, six steps, then onto seven," and "Will I make it down to eleven?" Eight, nine and ten have vanished. The need to rhyme with "seven" probably explains the gap, but whatever the cause, the effect is of time compressing, a child hurrying through the worst stretch or losing track of the count altogether.
Two later lines work on the body as much as the mind. "Holding my breath all the way down" is one of the longest lines in the poem, and you feel it running out of air as you read it. Then "Hoping the monster has gone and left town" releases the tension with a joke. "Left town" is the language of westerns, where outlaws skip out ahead of the sheriff, and it turns the beast into a troublesome lodger who might have moved on. There is also a quiet spatial twist. The monster lives under the stairs, and the speaker is walking down those same stairs, so every step lands on the roof of his home.
The ending swerves from "I" to "you." "If you dare go down my basement stairs" borrows the language of the playground, where a dare is a challenge you cannot easily refuse. The next line, "Watch out for the monster," is the only one with no rhyme partner, left standing alone like a sign. Then "He may be there" rhymes back to "stairs," so the poem finishes where it started. We never learn whether the speaker reached the bottom, and the word "may" keeps the doubt alive, leaving the reader alone on the staircase.
The poem is worth reading for how much it gets from so little: plain words, regular rhyme, a counted staircase. It catches a nearly universal experience, the dark space in the house that seems to breathe, and shows that fear is partly something we make by telling ourselves a story. It also treats that fear with a wink. The sneeze and the monster who has "left town" invite us to enjoy being frightened, which is much of why such poems are fun to read aloud.