years ago, my sister and i went for a walk near some open fields, and she let the dog that she was looking after , off the lead before we reached the full open space, not far from the main road, and you'd never guess.---
The dog turned round, stood for a second, and charged as the first car approached from the left, and he did a runner. he was knocked down and injured, and I had to go back to the owner and tell them what had happened. I was sobbing.
When you know a dog chases cars, never ever let them off a lead