none. every dog is different and learns different. For example, my Beanie is VERY submissive. He will only respond to praise and food. No scolding whatsoever or we'll start over at square one. My Charlie is the total opposite. He needs a firm snap of the lead sometimes to get him back on track. I cannot reward him with food or he will only want food food food!

I don't think any dog will benefit from scolding. Maybe corrections, but never scolding.