There's been a lot of advancements in dog training over the past couple decades as we've learned more about how dogs think and learn. I'm glad the video worked for you in the past, but there's lots of evidence now that methods relying on a lot of physical manipulation like you're describing can cause behavioral problems in the long-term. The best part is, there isn't a time limit for these modern methods, as they'll work safely and effectively with adults and puppies. Good luck on your hunt, but maybe suggest your friend check out some current dog training methods as well so they can decide for themselves what works best for them and their dog.