Buffy, my one-eyed cocker spaniel, acted normal on Sunday morning, even asking me to throw her ball. But ten minutes later, she stood still with her head down. She stepped cautiously forward and bumped her nose into the bathroom door, then the wall, then the corner. She sniffed everything. I waved my hand in front of her face. She blinked once, likely feeling the air moving. But her eye showed no movement.