请根据汉语提示,用英语写一篇80字左右小故事.

My father is live in a country.There is a dog named A-FU belong to my family. One day, my little sister went to farm with my parents, my little sister walked on the riverside and A-FU followed her. Suddenly,my little sister sliped down into the river in order to pick a flower.
A-FU gnared and jumped into the river at the same time.
My parents heard the noise and came to help. My little sister has been saved by A-FU, we all praise A-FU is a good dag.