I found an article that is pro early s/n and here is the link.
http://www.king.igs.net/~brica/esp.htm
They do stress how important it is to have a vet who is trained and comfortable in working on such young and tiny animals and this is a quote from the article:
Some shelters and veterinarians in private practices are currently performing ESP, but it's also important for breeders to understand why individual veterinarians may choose not to perform early neuters. An eight-week old puppy is not just a smaller version of an eight-month old puppy. There are important differences between the two in factors such as respiratory and cardiovascular physiology, drug metabolism and thermoregulation. Few practitioners have accumulated a significant amount of experience in anesthetizing very young puppies on a regular basis, since there are not very many situations which call for anesthesia that young.
Just as some argue that it is
basic common sense that the risk would be greater to breed a tiny female than an average size one, I would think some would make the same argument that it is
common sense that it would be riskier to neuter a young, tiny puppy under 6 months of age than one who is older, bigger and stronger.
Is this not true? If not, why is it not?