I got my little girl Jammies from the animal shelter and she was
supposed to have been fixed. Marked on her cage and everything. Imagine my surprise when one evening she just lays out in the middle of the floor and starts yowling like there was no tomorrow!
My poor older cat (fixed) just sat and looked at her like she'd grown another head...
I made an appointment for the next day and took her in. Nothing worse than a cat in heat.