Start Page and Natural news both tell us that pet chips can cause cancer. In the video from start page they tell us to make sure to check the chip site often to check for lumps. After watching this video and reading the article I know I would go back to a collar and tags if I were ever to own another pet. I am sharing this so that folks will know to watch the site of the chip if they have pets with one. Also so that folks considering having their pets chipped will at least know about the cancer before going through with it. Better informed than sorry later.