I went to a health clinic with my corgi and discovered his microchip was not there. He was chipped, but the vet said chips can come out more often than you think. He got rechipped there but I was worried about my other dogs - my friend in Texas who has rescued a lot of strays suggested I buy an inexepensive chip reader. It works right out of the box - so easy! I discovered my old dogs microchips went missing as well. Making an appointment to get their redone! Great to have on hand if you ever come across a lost dog or cat.