a shock collar -probably- won't do anything other than scare him and make him bolt even MORE. if he's already runnin off, and somethin he can't see or hear or smell suddenly zaps him in the neck, he's more than likely to just run faster.
do you know the reason why he runs away? like, is he chasing a squirrel off, is he scent following a trail, is he bored, is he trying to claim territory, is he just flighty by nature, etc? if you can figure out the root cause, that'll put you way ahead in how you approach training. shock collars are so often used incorrectly, confusing the animal even further and making things worse, not better. but it depends on the individual dog.
we just use a tie-out for my dog who can't be trusted
do you know the reason why he runs away? like, is he chasing a squirrel off, is he scent following a trail, is he bored, is he trying to claim territory, is he just flighty by nature, etc? if you can figure out the root cause, that'll put you way ahead in how you approach training. shock collars are so often used incorrectly, confusing the animal even further and making things worse, not better. but it depends on the individual dog.
we just use a tie-out for my dog who can't be trusted