Just looking about for any info regarding health issues. There seems to be plenty about. Here's a quote from PetPlace.com
http://www.petplace.com/dogs/the-ir...do-microchips-cause-cancer-in-dogs/page1.aspx
"Studies about the effects of microchip implantation have been going on for about 6 years after implantation. Mild inflammation was noted in some animals but most was gone within 3 months after implantation. There have been some reported adverse reactions in mice and rat studies. Reports surfaced that the glass-encapsulated RFID transponders microchips caused malignant, fast-growing, lethal cancers in up to 1% to 10% of cases in rats and mice. In 2004, a dog was examined for a mass over his shoulder area. The mass was removed and was found to be a sarcoma. Attached to the mass was a microchip."
I'm just quoting the text as an example, I have never visited the site before and I do not know if it is 100% accurate but there seems to be quite a bit to support the chips causing problems. 1 to 10% seems a very high figure to me.
No, I am not scaremongering, I am trying to find out what the truth is.