The correct area to administer insulin is in the chest and stomach
areas. so there should be no issue with a microchip.

From Dr. Deborah Greco DVM Phd ACVIM:

"Most vets and owners use the worst site to inject insulin – the
scruff of the neck.  This site has a poor blood supply and is prone to
forming granulomas.  Because of these characteristics, insulin is
absorbed very irregularly from the scruff.   The lateral thorax
(chest) and abdomen (stomach) are much better sites.  Injection sites
should be rotated to decrease the chance of granuloma formation."

If one feeds their cats a proper diet of canned or raw food, and
eliminates dry food (which is full of unnecessary carbohydrates and is
not a species appropriate diet), the chances of the cat ever developing
diabetes are fairly small and then would most likely be related to
steroid use or a secondary health issue.

Megan

                                   

Hi Phil,
Yes, I'd had it in mind for a long time, but had not decided what brand to
get.  As you may recall, we are planning an extensive trip and my primary
worry was which chip would be most likely to be detected and result in our
reunion should we and our cats become separated.  We are planning to leave
next March and are making arrangements now.  What I haven't mentioned here
before was that our trip will be by boat. I have posted on another newsgroup
about our project to acclimate Cinder and Rosie to becoming boat cats.
The one thing that really brought the urgency home to me was Hurricane
Katrina. So many pets are now in shelters throughout several states, and the
humans are scattered as well. However they got separated, a microchip would
make a big difference in reuniting the pets and the people.  It would be
much better for the pets and would save rescue organizations who are housing
those animals a bundle, too.
We got Home Again microchips.  We talked to the manufacturers of both and to
the local vets that sell one or the other. I asked the local Avid vet about
the Euro chip, and he said that if we were planning to take them overseas,
that would be the one to get.  However, there had been a report of a lost
pet with an Euro chip that had been found and put down at a shelter because
the scanner didn't read the microchip.  I don't know the details, such as
when or where or what kind of scanner, or maybe they didn't bother to scan
at all, or, maybe the chip just wasn't working.
I asked him if he checked to make sure the chips worked after inserting
them, and interestingly enough, he said that he didn't have a scanner
because they are so expensive.  However, we could take the cats to the
Humane Society to have them checked.
The vet also said that Avid had the greatest market penetration and he
recommended it because it was the best.
We chose Home Again because of the flexibility in being able to change
contact information ourselves online (which we could do while under way) and
because they are not encrypted and were told that all scanners can read
them. The Home Again clinic had a scanner, and checked after the chips were
inserted to make sure they were working.
I don't know what the Avid vet's clinic looks like, but he does advertise
that he has separate waiting rooms for cats.  The place we took them for the
Home Again chip was a little "hole-in-the-wall" place with a single tiny
waiting room.  But, they have a scanner.
Annie