Which is a commonly cited benefit of spaying a female dog?

• A. No puppies
• B. Calmer
• C. Less cancer
• D. Huge reduction in breast cancer

Answer: (D)

Spaying a female dog removes the ovaries and uterus, which cuts off the main source of estrogen that stimulates mammary tissue. With less estrogen exposure, the risk of developing mammary (breast) tumors drops significantly. This is why a commonly cited benefit is a huge reduction in breast cancer risk. The effect is strongest when spaying is done before the dog reaches sexual maturity, but any early spay still lowers risk compared with an intact dog. In addition to cancer risk reduction, spaying also prevents pyometra and unwanted pregnancies, but the standout cancer-related benefit is the substantial decrease in mammary tumors. The other options describe outcomes that are not as reliably linked to health risk reduction or are less specific.