I would try to hide some of the deercams on the property where they cant see them in strategic locations of the people that are doing this and use that evidence in court if possible.. if not use those pictures to confront the ranchers and tell them that you have proof and if they dont stop that you will press charges....Electric fence for the cows and dogs maybe?? or even get sandshot for a shotgun or rat shot for a pistol or a bb gun for the dogs to deter them..