Hi! Did you say puppies? How many do you have? I have two litter mates who are now 11 months old. Training is more of a challenge when you have more than one pup because they are so fascinated with each other. I agree with Maureen and Keith...12 weeks is very young even for one pup at a time to be attentive off leash. I suggest you take them separately on leash for very brief training sessions. Their attention spans will extend with time.