Good topic,we all have different ideas about bringing on terriers,many factors to consider, breeding, age,dogs temprament,everyone should know when there dog is ready,after rearing the dog to the best of your knowledge/ability and it does not work out,,, there is nothing worse,how many times do you keep trying the same dog,other things to consider when bringing on a pup are what it does when in the ground, thats if it does go..is it sounding away then coming out after x amount of time etc etc,so my answer to your question is,its down to the man who owns the dog to make that decision.unless you