I am sure this topic has been done before, but I can't find a thread 
I'm sure it's nothing to worry about , but my Poppy's fur has sort of 'changed'. She is a black/tortie moggy , and her coat is officially short-haired, but is I would say quite 'ample' and maybe a bit mid-length. Last few days, I have noticed it has changed from being laying flat to 'spiking' a bit. Not just down the spine, but practically all over. On her head, and on her back hunches when she is crouching/lying down. It isn't that noticeable, but it is to me as I know every hair on her 
I know it can be a sign of dehydration, but she is drinking/eating fine, and weeing fine (mix of wet/dry food). I also read it is a sign of anticipation/anxiety/fright, but she is an indoor cat (outdoor access available but she's not that bothered), and we are not decorating or anything and nothing has changed in human or cat routines.
Could it just be her normal 'development' as such? She is nearly 2 so is moving into full adulthood, so maybe her fur is changing like human hair does with age?
Am I missing something, or being just a PFC nutter?