I don't blame you. Those chips are rumored to cause cancer in animals. I just spent a hour researching it, but there is a lot of conflicting info on the web.
I won't allow any of my animals to be chipped
We are all cattle now!
Did you know that Saint Louis based Somark Innovations successfully tested an “RFID tattoo” on cows and rats? Yes indeed, tattoo, not the ol’ RFID chip found in passports, dogs, and Dutch VIP clubbers. Somark’s system uses an array of needles to inject a passive RFID ink which can be read through the hair on your choice of beast. The ink can be either invisible or colored but Somark is keeping mum as to its exact contents. They only say that it doesn’t contain any metals and is 100% biocompatible and chemically inert. The tattoo can be applied in 5 to 10 seconds with no shaving involved and can be read from up to 4 feet away — the bigger the tattoo, the more information stored. Best of it all, it’s apparently safe for humans to ingest allowing the FDA to track back Mad Cow Disease, e-coli outbreaks, and Soylent Green.
Don’t worry, they can’t track you just as long as you chew your food like mama taught. However, with “military personnel” listed as Somark’s “secondary target market,” well, it’s just a matter of time before we’re all cattle now isn’t it.
http://www.engadget.com/2007/01/18/rfid-tattoos-for-tracking-cows-and-people/