My adopted dog Johnny was playful, lovable, and simply adorable.  However, he was very aggressive towards some dogs and people.  So much so that at times, I thought I would have to return him to the shelter.  Instead, I hired Laura to work with him.  After only two weeks I could see drastic changes in his behavior. Laura helped Johnny with his fears of everything from certain dogs to strangers, to people wearing hoodies and walking with canes or crutches.  After a month of training, he was easier to handle and more responsive to commands.