Our 7 month old black lab won't walk any further than about 50 feet from our house. It's a quiet road with not too many distractions. We've had her since 3 months and she's not making any progress. If we take her in the car to the park which is only a further 100 feet around the corner she's happy to run around. She will dig her heals in and not go any further than what I've described from the house. She also always pulls to go down the garden path to go out, then gets so far and decides she wants to go back. We've tried treats and taking her favourite toys but nothing is working. And now she is getting bigger and stronger she's restricting her breathing by pulling so much to get back home. Any help please.