Desexing your dog or cat in Hong Kong: timing, benefits and honest risks

Desexing (speying females, castrating males) is one of the most common procedures I perform, and one of the questions owners think hardest about. The short answer: for most pets in Hong Kong, the benefits outweigh the risks — but timing matters, and breed matters.

For female dogs, speying before the first or second season dramatically reduces the lifetime risk of mammary tumours and eliminates pyometra — a life-threatening uterine infection that affects up to one in four unspayed older bitches and always arrives as an emergency. For male dogs, castration removes testicular cancer risk and most prostate disease, and reduces roaming and some hormone-driven behaviours.

Cats benefit similarly: speying prevents pyometra and mammary cancer, ends the distress of calling, and castration in males reduces spraying, fighting and the FIV risk that comes with it. Unplanned litters remain a genuine welfare problem in Hong Kong.

Timing is the nuanced part. Current evidence suggests large-breed dogs may benefit from waiting until skeletal maturity (often 12–18 months) to reduce the risk of joint disease, while small breeds and cats can typically be desexed around six months. This is a decision to make with your vet based on breed, size and lifestyle — not a rule from the internet.

The trade-offs to discuss honestly: desexed pets have lower energy requirements, so portions must drop to prevent weight gain. Some breeds show a small increase in urinary incontinence risk in speyed females. Neither outweighs the benefits for most pets, but both are manageable when you know about them.

Recovery is usually 10–14 days with an e-collar, restricted exercise and daily wound checks. If your pet licks the incision despite the collar, or you see swelling, discharge or gaping, call the clinic the same day.