She's not too young, you have to work on this straight away after all she does need to be excersised and stimulated. Try changing directions every time she misbehaves, this will result in you going up and down and not really anywhere which will annoy her and she will learn that if she wants to get to the park, she needs to walk nicely.
__________________ Indy, Benjamin and Malachi   There is no psychiatrist in the world like a puppy licking your face- Ben Williams |