Homework - Story

My teacher gave me a homework , the topic is : "Draw a big dog and write about your picture. "

in this photo I draw a dog ,ball , sun , 12 fish , 12 seal , a man with a hat on , water .

how is my picture ??

I wrote these lines :

The dog ate 12 fish , 4 seal . Then the dog played with the ball near the water. And dog bite a man with a hat on, and the man died.

How is my story ? my teacher told : oh dear - what a sad story .

ps: My son wrote the whole story on his own and ofcourse he drew it .