I can only get my puppy spayed at 7 months old, for various reasons.
Am scared shitless that she will come into heat before then. She spends time alone in the garden that a dog could conceivably get into if he wanted to jump down a 3-metre drop, so I would have to lock her indoors in August. I also cannot imagine how miserable she would be, and how much she would tear up my home, if she was kept from walks for 3 weeks.
So come and scare me some more with your tales or early puberty.