Other than a, "No! Let's go outside!" if I saw her starting to look around or squat, I did not discipline Lisl to potty train her. If she had an accident I said nothing, cleaned it up, and we went out until she pottied again. Sometimes those where some very long and cold trips outside.
What I did was take her out every 20-30 minutes at that age to teach her where potty was to take place and where it was not to take place. I also managed her water and food intake extremely close to get her into a semi-regular routine for going potty.
You do not want the pup to associate anything bad with going potty.
Bear, Anna, Molly, Ossie, and The Countess Lisl von Schlaf
An Unhappy German is a Sour Kraut!