My cat is approaching 12 months. She was spayed several months ago and has been going out for the last 2 months ish. She is lovely. Very affectionate towards me and sweet to my children.
However....we have lots of cats around where we live and my little cat fights them all!! She is very possessive over her garden (i suppose this is natural) and basically guards the perimeter pacing if she sees another cat nearby...
She does not care how big the bloody cat is - she will take it on! And so far.....Has won 
She is tiny - part of me actually admires her fiestyness - but one day she is going to come a cropper. Is anyone elses female like this?? Will she calm down - or is this just whilst she is still marking her territory etc?
All jokes aside - we love her and the thought of her getting hirt is worrying.