They do fine on a leash. I don't think we really do anything special because of their size. They're extremely gentle other than this one time and almost seem to be aware of how big they are.We have a 100lbs dog and we find him gigantic so it's hard for me to imagine a dog more than twice is weight, can he walk with a leash? Do you have to be extra carefull not to hurt yourself if you live with such a big dog?