Tabitha is being spayed on Wednesday and I thought while she was under an anaesthetic it would be a good opportunity to get her microchipped. However, I remember reading something recently about the chips moving and possibly causing tumours? I can't remember where I read it, it may have been on the dog forum here or somewhere else entirely. Tabitha's brother, Tigger, disappeared for five days recently and I wished then I had had him chipped. My cats do go outside, although only Tigger wanders, the others are all girls and tend to stay in my garden or back yard. One of them is already chipped as she was done before I rescued her but none of my others are. I know many of your cats don't go outside but those who have cats who do are yours microchipped and, if so, have you had any problems with the chip?