DogTown is a documentary about the medical care and training given to "hard cases" at a shelter in Nevada. There is some training, so if you have a dog you might learn something. But for the most part the show is less instructional and more of a documentary about the dogs that come into the shelter. As one might expect, it's touching, heartwarming, and poignant.
If you enjoyed these DVDs, I'd recommend volunteering at the Humane Society of Huron Valley. It's pretty much exactly like it!