Really! let me understand this issue. 1. You have a group of persons who do not at all comply with the law, and asking government to make another law for a different group to comply with. 2.There is an enforcement agency who interprets the law by "intent", (when they feel like it) and claim they are under staffed to enforce laws. But a few assemble persons are wanted to have their police authorities who are also under staffed to enforce a possible new law. 
It would seem to me if pet owners really cared about their family members (loveable pets) they would not want to endanger them on "public lands". I do not allow my family members to play on roads and highways,even though we have the right to be there.
We don't need another law that may or may not be enforced (costing tax payers more money). people need to be responsible, know were you are recreating and who else may be using the area. if you believe you or a family member may be a in a danger area, be proactive.