Dogs on leashes?

I read this recently in the Pathfinder:

Additionally, according to Missoula County’s website, there is no leash law for rural parts of the county, only within Missoula city limits.   It reads, “Dogs can be off leash under voice control anywhere outside city limits.”

Who's definition of voice control are we going by?

OK Thanks for your response.

Yes, I'd like to see dogs on leashes, especially in the morning when people are walking the summer home road.  

There have been some issues concerning dog fights, cars nearly running over dogs and more... This part of the forum is for the controversial issue.  Mainly in the summertime when everyone is walking the road.