A dog behaviorist works to change or improve various patterns of behavior in dogs. Pet owners often seek out a dog behaviorist or animal trainer to assess aggressive tendencies in their dogs. They may also need a dog behaviorist’s help if their dog has been through abuse or trauma. Job duties include evaluating the animal’s behavior, performing training sessions, and recommending changes regarding how the owner handles the animal at home. Some dog behaviorists undergo formal training experience to become a certified professional, using a variety of techniques to modify unwanted dog behavior over time.