This piece starts strong and finishes on another level. The whole poem builds a question of who the speaker is and what the circumstances are, so when the last line switches the tone from descriptive to explicit ("I'm not staying for dinner"), the rest of the piece suddenly hums with new life. Great technique. What I like most is the divide in the speaker: there's a twinge of self-directed bitterness ("Don't rot like me, so many fleas feeding from me") and almost a heartlessness (leaving the dogs outside, or maybe I'm just an animal lover?), but it feels like it's rooted in a deep devotion to the listener. So, is it self sacrifice for the better good or is the speaker too blinded by pain to recognize their naivety? I don't know, but the question keeps drawing me back... along with that last line. So good.