Nothing to do with territory marking. Hmmm...

I only noticed this with my Charlie (former stray) who has a very sensitive
back, I believe from some former car/human "accident" he had. He doesn;t
like on bit to be touched near the tail or the tail, so I believe he had the
tail broken at some point which healed badly. So now when I am stroking him
if I get too close to sensitive areas his skin is "crawling" and, even
though I don't think he's in pain, he does tend to look at me at that
moment, and if I continue touching that spot, he runs away. He definitely
doesn't like it. My neighbors Timmy does tend to display this too, and
always looks at me like "oye, wot u think u doin" but then calms down.

I dunno, I guess it could be some very sensitive spot we hit(with lots of
nerve endings), which could be either pleasurable or uncomfortable.

I wonder if it's something to do with cat hairs standing up when seeing an
enemy? perhaps we touched the nerve :) For real :)

Gee

Yes.

I don't know what it is, though.