I'm going through the same thing with my Newf she took off for half an hour yesterday..Thing that frustrates me the most is when you call your dog,they look at you then turn and run..I was a mess yesterday i went after her,did not chase her but she had led me through fields swamped ditches finally i got a hold of her and we came home so now i will be having to take her back to obedience,or something i will not have a dog that runs!!!! So as a reponsible pet owner i have to take action in getting this fixed!!!,