i am now having a tattoo stamped prinnie,s ear as i am told by my vet that this is safe and as permenant as a chip apart from the fact it is harmless and has no side affects it is slightly more expensive but to me if it identifys her and is safe then its worth itthanks for yor reply. can i ask wherehave you heard of this before i am intresed in all infomation as i am trying to research the chip to build a case to send to bayer who make the chip to rectify the problems is is causing to pets.