That’s why humans receive hormone replacement therapy (HRT) to counteract the loss of vital sex hormones when women undergo hysterectomy or men are accidently castrated.
Underproduction of estrogen and testosterone causes debilitating disease and premature aging in humans.
Castration is directly linked to heart disease, myocardial infarction, strokes and cardiovascular disease, senile dementia, osteoporosis and hip fracture.
Hysterectomy risks in female dogs are intervertebral disk disease, Myasthenia Gravis, muscle weakness, a doubled risk of splenic hemangiosarcoma, and bladder and urinary tract infections are so common they are called “spay incontinence”.
And as in male dogs, females have five times the risk of cardiac hemangiosarcoma and both sexes suffer from lethargy, exercise intolerance, and obesity. That’s not all. Neutered dogs of either sex are at double the risk for osteosarcoma and increased incidence of urinary tract cancers.
The deadliest cancers and the most annoying problem for house dogs is at the top of the list for castrated dogs. Urinary incontinence. Spaying or neutering also significantly increases the odds of adverse reactions to vaccines and inclines both sexes to alopecia, hip dysplasia, and cruciate ligament rupture.
It's easier to cope with heat seasons than urinary incontinence, orthopedic problems, lameness, and cancer in your old dog.
The canine testicular cancer rate is so low that there are not even any statistics on it!
Castration to prevent testicular (or ovarian) cancer makes as much sense as removing the heart to prevent heart disease!
Read more here.