Very good video indeed! But I prefer training without treats or clicks, for you do not know if they are always going to be availabe. I taught Cayo respond to the "stay" command, so anytime I open a door, (any door), I give the command and waited for him to respond. If he stood still I gave and still give a praise. He responds to it, but you have to be consistent and do it always. You can start with the harness on. Now he stays when I say even though doors are open.
A very good book is "Teach Your Dog 100 English Words" by Michelle Welton, link here:
http:// http://www.yourpurebredpuppy.com/books/TYD.html