Another option is the Walky dog http://www.sitstay.com/store/equip/eq6.shtml . I use this with my dalmatian on the unpaved rails to trails where there aren't a lot of people. It is very easy to install. My dog is obedience trained but if he sees a critter sometimes he can't contain himself. I used to just hold the leash until he decided to stop and pee one day and the leash caught on my finger. Since I installed the Walky dog everything has been fine, even if he tries to stop or sees a squirrel. I attach the Walky Dog to a harness and still hold a leash attached to his collar for extra control when we stop.

Kathy