A few seconds later, a man, about thirty-five years old, entered the elevator with a large light-colored dog. My sister and I love dogs — and when we saw the labrador, we were happy. She even smiled and wanted to reach out to him, but then everything suddenly changed.The dog suddenly froze, staring straight at my sister. Then, as if sensing something, it stepped closer, stood on its hind legs, and put its heavy, fluffy paws right on my sister’s chest. She screamed sharply, almost crying from fear, and I stood frozen. We both thought the dog would bite.