I use both a springer and a walkydog- I prefer the springer, especially if there's squirrels around. I usually work two at a time, hooked to a coupler. The distance you are going is probably fine for now, it's even better if you can do it on packed dirt or gravel rather than pavement. My riding is mostly pavement, so I only go 2-3 miles- both my dogs are 6 and have some chronic injuries, so we go slow and I don't push them. If they see a squirrel or deer I just come to a stop- I've never had them come close to pulling me over with the springer, but with the walkydog I have to brace myself and stop to get both feet on the ground.
vickie