I wished Tiki's breeder harness trained too. We brought him home at 6 1/2 weeks old and tried the harness. We put it on ok and went for short walk around block but he was scared stiff and struggled when we tried to take it off. So much so that we were afraid to hurt him. We tried it again one other time and can tell he really doesn't like it :-(. Will just stick with the PakOBird.