Read your pup and you will know.
My pups come out with me from as soon as they can, but it depends on what you regard as "run." Now I wouldn't lamp my pups too young, but saying that it's good to give them a taster, to encourage their drive.
Only you can tell, saying that if your not sure, hold back until they are well developed and then introduce sloooowly.
Good luck mush.