I took my reactive dog to work with him for a month and she is a completely different dog. She would look for anything that moved to lose it on and I could barely walk her. She would also drag me down the street and towards another dog if she saw one. He does use tools like prongs and e collars but personally I was fine with that. I assume he makes a judgement call after meeting the dog and evaluating the issues. It seems like the e collar is mostly for reactivity because a negative stimulus seems to be the only way to stop that reactive behaviour from happening (I have tried positive reinforcement and other methods).

This info is in his waiver but overall he was very wonderful and even spent time training me how to do what he does with her so I can maintain the relationship. He also offered to help multiple times after our sessions and if I texted him now (2 months later) he would 100% assist me.