I wanted to post on that this morning. After all, when you get to thinking about it, my great-grandmother didn't "fix" any of her pets, but jump forward to the late 60's and pets got fixed. So what happened?
I can't find out exactly, though it does seem that the sterilizing of smaller companion animals did gain prominence in the 60's. Also, if I remember my James Herriot correctly, he was doing spays and neuters in the --what, 30's, 40's?
If you know, please give me a heads-up adn I'll post it. Meanwhile here's a well-thought-out bit on "how young is too young to neuter" by Dr. Dave Sweeney at Utah's Best Friends Animal Society.
PS: She's still fine. I can't believe how high she's trying to jump. We keep telling her not to, so she spends today locked up in the office.