Originally Posted by
shazamataz
I have only ever had experience with collars v harnesses when walking, so I have just always used collars as they give you more control when walking.
If you think ihe would slip out of a collar then yes definately a harness.
Problem is, they associate the collar/harness with the shock they get.
My mum just bought a citronella collar for her Dane and he barks his head off when he doesn't have a collar on but as soon as one touched his neck he won't bark.
Same principle with the fence, they are pretty smart dogs so he would probably figure out that when he doesn't have the harness on, he isn't going to get shocked and can run outside the boundary.