Neutering procedures are the most common elective surgeries veterinarians perform, and are very safe when conducted by a veterinarian under sterile conditions. Random bred dogs should certainly be neutered, but reputable breeders agree that purebred dogs not in a professional breeding program should also be sterilized. The line about spaying or neutering making a canine companion turn chubby is practically a classic. The truth of the matter is that any overfed, under-exercised dog can put on weight regardless of its sexual state. Nor will neutering or spaying cause a dog to become lethargic, although if a male has been putting all his energies into pursuing lady dogs with lust in his heart.
Some folks tend to anthropomorphize their pets.
So they see the act of neuteririg a male as somewhat dcgrading and robbing him of his macho nature. Or they regard spaying as depriving their female of maternal rights, taking away her femininity. This is so wrong. Dogs are dogs and people are people. Dogs don't even understand romance - candlelight and soft music are wasted on them.