A grown man lays his head in someone's lap and, for a few moments, lets himself be a dog. That small scene is the whole poem, and the title announces it before the first line. Its central idea is that devotion asks us to put down our dignity, and that the relief of doing so is real but short. The last line makes the surrender temporary: the speaker will "get up and / be a man again."
The opening gesture is odd and slightly startling. The speaker doesn't say "my head" but "this head," as if it were a separate object he has carried across a room, the way a dog brings something to its owner's feet. What he brings is "full of breathtakingly / beautiful / images of yourself." The gift is not flowers or an argument or a confession. It is the beloved's own beauty, collected inside his mind and handed back to her. Love here works like a mirror: he has been looking at her so long that she is all he has to give.
Breath runs through the poem and holds it together. "Breathtakingly" appears early, when admiration is still a kind of shock. Once the head is in her lap, the speaker says, "Now I breathe / more quietly." The poem's emotional movement is that one change, from awe that takes the breath away to a calm in which breathing comes back. The line breaks help. "Breathtakingly" hangs at the end of a line, and then "beautiful" gets a line to itself, the one place the poem lingers over a word as if it were being stroked. The first seven lines are a single sentence that ends on "lap," a heavy, settling word. The sentence has arrived where it was heading.
After that the grammar changes. The sentences shrink and begin with "Now," three times: "Now I breathe," "Now you pat me," "Now I sign." Each "Now" marks a beat of stillness, like moments in a slow scene. The pat is the only action the beloved takes, and it is exactly what one gives a dog, which makes it affectionate and faintly comic at once. A note on that last "Now": as printed the verb is "sign," which may be a slip for "sigh," since "sigh" fits the poem's breathing pattern so naturally. Even read as written, "sign" suggests a wordless gesture, a signal made without language, and wordlessness is the dog's whole way of speaking.
The ending turns on tone. "In a moment or two" is offhand, almost businesslike, and it deflates the tenderness just enough to be honest. Then comes "be a man again." The word "again" implies that being a man is something to put back on, like a coat or a role, and that for these few lines he has been something simpler. Being a man is the effort, and being the dog is the rest. The poem never explains why, and it doesn't need to. The humor protects the vulnerability, because a man who jokes about his own doggishness can admit how much he needs to be touched.
The plainness of the language suits this. Nearly every word is short and ordinary: "bring," "put," "lap," "pat," "get up." There is no rhyme and no fixed rhythm, only short lines that read like quiet breaths. The poem does run to fourteen lines, the length of a sonnet, though it has none of a sonnet's rhyme or formality. That may be coincidence, but it fits a poem that offers love in a deliberately small, unceremonious form.
The title is a small joke too. "Big Dog" suggests size and status, yet the poem shows the speaker making himself small enough to fit a lap. Strength is what he sets down, and the poem's quiet claim is that this is where tenderness begins. Few love poems are so willing to look a little ridiculous, and that willingness is what makes it persuasive. It trusts a posture, a pat, and a held breath to say what grander language might overstate.