A dog spends a whole afternoon in the yard, calm and fully at home, like a king who needs nothing. The speaker watches him, and the poem turns quickly from that easy picture to something less comfortable. The speaker says they "play with / his trust," and the phrase is double-edged. It can mean simple, affectionate play, but it also hints at handling something fragile, maybe even taking advantage of it.
That uneasiness is what the poem is really about. The dog's love is plain and unquestioning. The speaker's own feelings seem more tangled, "troubled / by love as art." One way to read this is that the speaker is aware of turning affection into something shaped and observed, as a poem does, instead of simply living in it. The title, "Better nature," suggests the dog may have the better one.
The mood is quiet and sunlit on the surface, with a thoughtful, slightly guilty undertone. It's a small moment that leaves a lingering question about how honest it is to write about those we love.