When I woke up one morning last week, I couldn’t move. The cold air was raising goose bumps on my bare shoulders, but I was pinned beneath the blankets by two dark lumps. I managed to free one arm, and with all the strength I could muster at that early hour, I gave the blanket a good yank. It moved about six inches, dragging with it 130 pounds of Labrador retriever. As the dogs sighed and tried to decide which part of my leg made the best pillow, I lay awake wondering, how did I get here?