Intesting...
But a bit boring, in the beginning there is nothing but a dog and man walking, that will give a sign to users that it is boring and they will close it and give a bad reveiw. So in your future flash's, I recommend you put something interesting in the beginning so keep users focused on the project.
It was good, but just the way you set it up made it boring. Also, it's unsual a car would drive on the sidewalk and run someone over. Please improve your skills on the story, think about it, check for obvious errors before submitting, and you should be ready to go.
4/10 for effort