Quoted:
Our 6 month old Lab pup is a drywall destroying machine. I've caught him in the act over a dozen times. Everytime I've caught him in the act I yell NO! to startle him. After a lot of times hitting the same patch of drywall I combined a loud no with a two fingered slap across the bridge of his nose. I don't believe in hitting dogs but I'm at my wits end. Anybody dealt with this successfully or have any advice?
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If a puppy isn't eating, drinking, peeing, pooping, or sleeping, guess what... at least 90% of it's time is spent CHEWING. That's just what puppies do.
You need to redirect it to getting them to chew on things that are OK to chew on. Give them all the chewies they want. And, KEEP THEM FROM GETTING USED TO CHEWING ON THE DRYWALL. Put it in a pen when you can't watch it if you need to. Get them redirected onto positive stuff!
Also, you should already be training... getting them used to "yes" and "no". When they chew on drywall, interrupt, redirect them to something positive, then "yes" them for the positive behavior.