I have a dalmatian. Dalmatians are coach dogs and used to run alongside or under coaches. Now we have road trials. See http://www.touchmoon.com/dotters/rd-field.html . Many people who don't have access to a horse bike with their dals to condition them for road trials.

I use a Springer like attachment on my mountain bike to exercise my dog on one of the rail to trails paths.

Kathy in Seattle