A few videos I recommend to clients. They cover some of the same ideas we work on together: claiming your space, the walk and how training tools work.

How to Claim Your Space (YouTube: Cheri Lucas)
Learn To Train The Good Dog Way: The Walk (YouTube: TheGoodDogTraining)
Learn to Train The Good Dog Way: Intro to Prong Collars, Part 1 (YouTube: TheGoodDogTraining)