Neutering male cats causes urethral obstructions which can lead to death. Exhaustive studies have indicated that urethral obstructions are not affected by whether a cat is neutered or not. One out of every four animals brought to animal shelters is a purebred. The cost of surgery is too high. Costs tend to be higher in cities and lower in rural areas.
Pets lament their lost capability to reproduce.
Pets do not to nurture their young for 18 years, watch them go off to college or whatever, marry, and produce grandchildren. Dogs and cats nurse their young for a few weeks, teach them to behave like dogs and cats, and go on with their lives. Males know next to nothing of fatherhood. The possibility of uterine or ovarian cancer is eliminated. Neutered males have a lower chance of developing prostate infections.