The Buzz: Based on the true story of Jesse James Hollywood, Cassavetes» film was created with some below - board assistance from the LAPD, which is part of why Universal has pushed Alpha Dog back so many times.
Avoid trainers who recommend using physical force (e.g. alpha rolling, pushing a dog into position, hitting, choke chain or pinch collar correction) or methods / devices that have the potential for harm, as an acceptable way to train.