We have a young dog (4 month, 20 pounds, boxer/border collie mix) that
seems to be afraid of leashes and will sit and dig in with her legs at
the prospect of a walk. We've had her for a day, but she seems to be
an otherwise sweet and well adjusted dog.

There seems to be lots of advice for dogs that pull forward on their
leashes, but not for dogs that hold back. Can anyone suggest a
strategy for taking walks?

Stephen