I dont know about where your from but here, someone comes in and tries to hunt on someones land without being told they can, and get caught. LOL I guess its different in other places. Here I garentee you it wont be a friendly encounter to say the least. LOL Come and ask me, respect my wishes, take care of my property, dont pop a top till you leave, no problems. Dont you will have a problem.
A dog on my property is a stray. I have every right to put it down and will. I would expect the same if it were my own dog. I am responcible for that animal and its my fault if I do not make sure its under my controle. If you hunt this way part of your responcibility is to secure the right to be on the place you hunt, even if it means letting the land owners around you know that your running dogs just in case one does get away from you. If they say no then make sure you and your dog dont go there.
Isn't your job? Why not? I guess that makes you just a part of the problem. Too many people just dont want to get involved. "Not my job man, you do it!" Its every hunters job and responcibility to weed out the bad apples.