Well, I don't have a girl, but Chewy got fixed 2 weeks ago and he was fine. It took him a couple of days to bounce back and he did do some crying, but keep those pain killers handy. Britt has some really good info about spaying on the
http://mylittlemia.com/ site that was really helpful for me. You can get some good info.
Good luck girls! You will do great
