Posted : 2/5/2012 11:50:42 PM
Luke was neutered at 6 months, because my breeder contract said I had to do it by then. I asked my vet about doing it earlier, and the reason she refused was primarily because of teeth. She said that if he hadn't lost all his baby teeth by then, they would pull what was left at the same time. He also had a small umbilical hernia, and she wanted to see if it would resolve on its own before neutering him. He still had baby teeth (maybe they would have come out on their own in a few more weeks, maybe not, but they were pulled) the hernia didn't resolve, so that was also repaired. He's on the small side for a cavalier, has never learned to lift his leg at all, never marked anything, and doesn't hump. By a very bizarre twist, he does masturbate (it's the most bizarre thing ever, he basically steps on his penis. It's very strange.
Pigeon was spayed after her first heat, because we happened to get her during her first heat from her dumb previous owners. She's a mix so I have no clue if her size might have been different, but she's fierce humper of the cat, and toys that are about the size of the cat.
Callie was spayed at 6 months, and she doesn't hump, or anything like that. She is the smallest at adult size from her litter, and that I know of, several of them weren't spayed or neutered. However, she was already noticeably smaller at 2 weeks old.