When a cat is scared, their hair will stand up pretty evenly over their body.
Female cats blossom/develop around 6-10 months and males reach it between 9-12 months. Ideally, you should spay your cat around 4-5 months old and you can neuter your cat as soon as they come out of the birth canal! OK, on a serious note, I’m just kidding. You want to neuter just around 7-8 months old but it can be a little sooner.