I really don't see how a chip can cause cancer. There is no radio frequencies emitted by a chip. It's just an inert chip that can be read by the sensor. The sensor however probably does emit some radio frequencies but only for a second when it's scanning. The dog gets more exposure to radio frequencies every day from TV, radio, and other radio waves in the air.
The GPS might be different but I doubt it is transmitting all the time. Normally it would be off until you turned on the locater then the cell circuit in the GPS would be dialed and activated to give you a trace. Or at least that's how I think they work. The danger from cell phones comes only when they are actively transmitting. Otherwise they are just monitoring the frequency for an incoming call. Also the studies that linked cancer to cell phone usage were conducted back in the days when most cell phones were analog. Today's digital cell phones don't emit near the radio frequencies those old phones did.
I won't put microchips in any animal I own. Do you really think the veterinary community is going to tell their clients about this? Think about vaccines, do any vets tell their clients about the risks of those?
How many pets are given vaccines and chipped the same day?
Is there a central registry for tattoos? I seen a number of emails on various forums asking, "Can anybody identify this tattoo?" The responses were often not useful in identifying the dog.
I know that organizations like USA keep a list of tattoos as part of their breed registry and for trial scorebooks. They have been occasionally helpful in returning lost dogs.
If you are concerned about finding a lost dog, the first thing you need is a good, clear front and side photo of the dog. It's also a good idea to be in the photo with the dog -- it helps prove ownership.
A few years ago, someone dropped off a lost Shepherd puppy at my place. The dog only had an outdated county dog tag on his collar. No chip, no tag with the owner's name. After a bit of internet scouring, I was able to find a phone number for a very relieved owner -- the dog had been out on the run for three weeks and they had almost given up looking for him. His place was about ten miles from mine.
I later found one of the flyers they had posted. It has a grainy, photocopied photo of the dog's face looking up at the camera. You know that shot -- the dog is lying down, you are standing over him and you get him to look up at the camera. It looked like about every other German Shepherd out there. If that was all I had to go on when I had found the dog, I'd probably still have the dog.
Is there a central registry for tattoos? I seen a number of emails on various forums asking, "Can anybody identify this tattoo?" The responses were often not useful in identifying the dog.
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