Local name joke

One day, Xiao Er Gou drove his dump truck into town. On the way, he teased an old nurse to take a taxi. The second dog sat behind the dump truck for him. On the way, the second dog was in a bad mood and hummed a little song and went to the city to collect it. The second dog forgot the old milk and sat in the back, just like the car. It took him a while to remember, so he ran down to have a look. The old nurse saw the second dog and said, son, I'm really sorry.