If they are honest Primarily for Population control in both countries. Vets assume that many of their clients are not responsible enough to ensure their entire animals so not breed, or think they may be tempted to breed a litter just because they can.

This link will give you a balanced view regarding the health aspects. http://www.naiaonline.org/pdfs/LongT...uterInDogs.pdf

Neutering is primarily done for human social reasons.

IN fact neutering was illegal in some Scandinavian countries on welfare grounds until very recently.

Myself I sopay al my bitches we they are aroudn 7 years of age to prevetn the risk of Pyometra, and I am happy for animals to be neutered once they reach physical and mental maturity.

The very growth of the developing dog is altered by neutering.