After reading another post about a doodle that was taken from its yard by a person driving by (who can blame someone for falling in love at first sight?) I got worried & started to think about some permanent identification for our dogs. Does anyone have experience with the implanted microchips? What are the pros & cons? Is there a brand that's best? How much does it cost & is it painful for the dog? Do they have to be anesthetized? Any feedback would be welcome.