The microchip experience was horrible about 2 years ago
I was given a handsome black male cat named Hioudini,
a friend of mine suggested the microchip so I had it done.
Hioudini developed several infections at the site we cleared
those up at first but the infections continued to come and go for the
next 5 or 6 months. Finally I had to have it removed and everything cleared up. So I swore never agian would I implant a foreign object
in any of my animals. Hioudini has since went to the Rainbow Bridge
(he was a severe diabetic and his kidneys failed on us)

My vet told me about how the hunters in our area will have
there hunting dogs tattoed usually with a mark of the owners
choosing. My animals 3 cats and one dog are all tattoed on
there left hindquarter with a lucky 4 leaf clover and a number
that I choose when the first one was done. My vet uses a topical numbing cream before hand to minimize pain. and the tatto is
only the size of a nickle. None of my animals have had adverse reactions to this so it is my preference to the microchip. I know
that the chips can contain alot of information so for my Pheniox
(who does have some health problems) she wears an additonal tag
that I ordered from lifealert(they make id tags for health
problems for humans) all of my animals have tags with
their name, mine and my husbands name and our work and
home phone numbers.

And yes Isabella was already spayed.