since we are talking about tapes other than walters tapes. the best i have ever found for mike lardy's. he will teach you everything you would ever want to know about dog training and then some. anyone who has watched his videos, im sure will say the same.most prosand field trilers alike go by his videos to the T and have great results.here is a website for them if you are interested.www.totalretriever.com. this guy is known world round for his outstanding training methods and amazing dogs.. worth a luck see if you get time.
Jeff Smith