Cat doing her business inside!

[cazza4]

My kitten is about 9 months old and for some unknown reason I've come home today and she has done her business of the number 2 kind on my bed!! She has twice before done a number 1 on a buffet in the front room which was her own little seat, so in the end I got rid of it. She did come from a big family before me - lots of dogs so always in company. Now she's in on her own is it a cry for attention? Any idea anyone? Is it because something is scaring her?