You can train everyday for years, but is that going to keep FIDO, with years of breeding instincts to scent and chase, from chasing something JUST THAT ONE TIME out of the yard and into the street?
I would never want my dogs to get a negative action (shock) for doing what I want them to do (scent) or for doing what they were bred to do (hunt).
In My opinion I would suggest a standard fence for hunting dogs and a hunting E collar or beeper collar when outside the fence for training or hunting.
House dogs or farm dogs, the PETSAFE E fence is a great option.