I have heard excellent things about the harnesses made by this guy: http://www.larzequipment.com/ . I've been conisdering one of his leash/collars for a while, but am not sure of Riley's walking/running future any more. One of my friends who is a very big Husky fan pointed me to this site.

**These are designed specifically to prevent pulling. It's a harness, but it does not allow for more "body" pulling.**