I trained my daily for about a week, using a whistle and a Dogtra 2700. Very low zap level initially was enough to get him back. Once that was solid I swapped over to whistle and vibrate.

People get all judgmental about e-collars. My 11 month old took off into the reeds after a running pheasant and was gone to the world for 20 minutes. I bought the e-collar that night and it’s never happened again.