welcome. like you I am new to the breed. I just got Jax about three or four weeks ago. I took him today and got a gentle lead head collar because I had no control over him. I was advised not to use the easy walk harness as most cases they don't stop pulling they pull harder. Jax is three and like yours had very little training. He knew sit and shake when we got him and He is now starting to learn drop it, down, and lose leash walking with the help of the gentle leader. I have been just as frustrated at times but they are so worth it.