Yes, he'll probably be sore from "tip to tail" on Monday.
I had wanted to have him neutered at about 12-14 months because of the new studies which discuss the higher rates of cancer, increased chance of hip displasia, increased risk of adverse reaction to immunizations and a few other risks, which have now been linked to having male dogs neutered before adulthood.
However, I was not expecting to have him put under anethesia (for his teeth). So now I've had to weigh the risks of neutering before adulthood versus the risk of having him put under anethesia now, and again in 6-8 months.
Not an easy decision.
Link to article on risks/benefits of early spay/neuter:
http://www.naiaonline.org/pdfs/LongT...uterInDogs.pdf