HaHa. This reminds me of an old hunting spot on Beaties Ford Rd. we had. There was this really anti-hunting lady who owned land next to our hunting tract. Everytime we would park in the evening to go hunting she would always be there telling us how wrong hunting was and how she would go through the woods on her land and ring bells and spray perfume etc. [Looking on topo maps her land was tops]. Anyway we ALWAYS saw deer and scored on some nice deer. She would leave these partion type letters on trees along the roadway to stop hunting with her number.
I ended up quiting hunting there cause it was aggravating.
But the funny part was my buddy would call her number and tell when he was going to hunt there so she'd go through ringing her bell and chase all the good deer to him.lol. She was the one causing all the bountiful meat in his freezer.
But to the original question, me personally I wouldn't hurt the dog.
I'd print off an official looking form from the internet, looking like a Fish and Wildlife notice informing the public about an outbreak of rabies or something and post it at the trail head.