Ok, so if you are 99% sure you know who it is, go to the jerks house and tell him on no uncertain terms if he comes near your property or your animals again, it will be the last time he does anything.
Let him know you are on to him, scare him if you can. Tell him he got away with it once, but like he-double hockeysticks will he get away with it twice. If you have to, warn him you are prepared to use whatever means necessary to see to it he does not mess with your animals.
If he gets mad and/or calls police, they can't do diddly to you for talking to the guy. The important thing is to make this scum believe he's pushed you too far this time.
Gale