Gonzo was also registered with AVID, alltogether it cost about $30 for the microchipping and everything. very, very worth it. you don't have to freak out (as much) about keeping tags on your dog at all times. a few years a go, a girl I know had a GSD who got out and got hit by a car, and smashed his femur bone. When animal control found him (without tags), they wanted to put him down right there, but they scanned him and saw who owned him. they contacted the family and he got rushed into surgery and is now 100% healthy and happy (Gonzo and Hugo were actually just running around the park together yesterday)... that story definately convinced me to get my boy chipped xp