Being a former deputy sheriff, I always try to use the "cooler head" approach. Obviously, this game came onto his property univited and left a note. I would surely make sometype of phone call to the sheriff department so a report is on file that this man has threatened your dogs w/ death. Then, and only then would I pursue anytype of conversation with the man.
I am a hot headed dago/coonass all in one. Some man come on my property and leave a note that he is going to kill my dogs...........uhm- Houston we have a problem! Just saying, make a report in case it escalates you have it documented and save the note!
Yup X2 I get hot real fast when someone makes a threat. I can help out with a camera system. It can even notify you when movement is detected. I don't mess around. I like video because there is no arguing the facts. Then even if he leaves a note you can prove who did it.