[nagdu] Pull in the harness?

[Raven Tolliver]

Hi,
In all the chat about guide dogs, especially people getting new ones,
the subject of pull comes up. Some people need a light pull in the
harness and others need a heavy pull.
I paid attention -- to this while I was walking with the Golden Guy,
and there is generally no pull, or only a very light pull in the
harness.
Why are different levels of pull in the harness necessary?
Thanks.
--
Raven