Only way to deter these fuckers microchip your dogs freezebrand if ya have to take plenty photos of what ya have more recent the better at least then ya can post them forums like this if you are the unlucky person this happens. Trust nowan always view everyone with suspicion the less helpfull you are with the better dont give anyone the opertunity ta come throw it all back in your face. Just a simple bit of advice lads hope it helps.