I'll see your 'Dangerous Dog' law and raise you a STATE-WIDE leash law.

Citation: LA R.S. 3:2771
"No person shall suffer or permit any dog in his possession, or kept by him about his premises, to run at large on any unenclosed land, or trespass upon any enclosed or unenclosed lands of another."

Local law enforcement is familiar with this law, to the point where my riding group has actually made an appointment with a sheriff deputy to deal with a loose, problematic dog on a favorite route. He met us at the appointed time & place, then watched us ride past the house in question. When Fang came charging out from the car port, the deputy drove up to the house & cited the owner, with us cheering him on.

No more dog problem. Plus this law give cyclists clear right to press the case against the dog owner, in case of injury or damage. Or the right to shoot the dog. if threatened. Basically, a loose dog has little right to exist.