ok so i just got my dog, he is still a puppy, probably around 9 months at the most, what is the best way to teach him to heel? right now i am doing where when the leash gets tight i stop till he comes back a few steps and the leash isnt tight any more than we can walk again, is this a good way? also he has seperation anxiety how can i control that from happening? how do you teach a dog to calm down, i know he is a puppy but sometimes i would like him to calm down some. any training advice would be much apperciated, he is very skiddsh and shy, also sometimes on a leash, he has gotten better in the last 2 days, he just shuts down, he will just sit there and not move not so much when i get him outside, its going thru doors for some reason, even if he is not on a leash he gets a little weary of it and most of the time takes a lot of reassurance before he slowly walks thru the door