When a puppy comes to the world, he is wet and cannot see or hear. Soon his mother licks( 舔 ) him dry and feeds him milk. The puppy brothers and sisters sleep together. When they are awake, they stay with their mother. Mother dog takes good care of them, she licks them clean. When the puppy is about twenty days old, he can see and hear. He can go for a crawl, he can walk, but he can ’ t run fast. He sniffs( 嗅 ) the floor as he crawls along. When he misses his family, he barks, and his mother comes to him soon.