Mark noticed the difference most on their Saturday hikes. Before, Daisy was always scanning the horizon, her nose twitching for a scent that had nothing to do with him. Now, she trotted a few paces ahead, constantly looking back to make sure he was still there. When they reached the summit of their favorite trail, she didn't try to wander off. She simply sat by his boots, leaning her weight against his leg—a silent, steady anchor.