When I take my dog for a walk she doesn't go very far, only 4 or 5 houses away from our own house. She's 4 years old, a mixed breed staff / mastiff, and she's a very nervous dog. She doesn't like strangers so I take her out in the night time. And when we're on the walk she pulls a lot and won't go in the direction I want her to, I have to follow her. And if a loud car goes by she darts straight for our house and goes in.help?