He watched her familiar shape getting smaller as she put more distance between them, literally and figuratively, her body as untouched by childbearing or age as he'd always known it would be. She was a lean, lanky Golden Retriever built for distance, not sprints; for action, not sedentary introspection.
Rex let out a mournful howl that echoed painfully inside his human's head. A short, vigorous shake couldn't cut off the internal dissonance. "Let it go, Rex!" blurted his human, "We're all better off this way."