I recently purchased a harness and have been slowly introducing it to pheonix. Today he put his whole head in the harness and freaked out after that.. I tried taking it off fast but he kept flying to my shoulder, and when I would bring him down to take it off he looked a bit crazy... well I finally took it off and I thought for sure he was gonna be scared of it, but I don't think he is because he didn't get spooked when I brought it close to him... Anyway I don't want him to hate the harness... I would love to hear any suggestions! 
