It’s the most common surgery we perform, and for most owners it’s their pet’s first anesthetic. Here’s what we recommend, when, and what the day is actually like.
When to Do It — This Has Changed
The old advice was “six months, everybody.” That’s still right for cats and for a lot of small dogs, but the evidence for large-breed dogs has moved, and the right age now depends on your animal.
Cats — around five to six months, before the first heat. Female cats come into season early and repeatedly, and male cats that stay intact spray, roam, and fight. There’s no good reason to wait.
Small dogs, under about 45 lb — around six months is still the usual answer.
Large and giant breeds — often better to wait, sometimes until twelve to eighteen months. Sex hormones are part of how the growth plates close, and several large breeds neutered early show more cruciate ligament injuries and hip problems later. For males that usually means waiting. For females it means weighing that against the next point.
Female dogs, either size — spaying before the first heat cuts the lifetime risk of mammary cancer dramatically, and that protection falls away with each season she goes through. Spaying also removes the risk of pyometra, an infected uterus, which is a genuine emergency we see in older unspayed dogs and which is far more dangerous than the routine surgery would have been.
So for a big female dog there is a real trade-off, and it deserves a conversation rather than a default. Ask us at a puppy visit. We’ll give you an answer for your dog — breed, size, household, and what she’s likely to be doing at two years old.
What the Surgery Is
A neuter removes the testicles through a small incision. A spay removes the ovaries and uterus through the abdomen; it’s a bigger procedure than a neuter and the recovery reflects that.
Both are done under full general anesthesia with the same standard of care as any other surgery here: pre-anesthetic bloodwork, an anesthetic protocol built for the individual patient, a team member assigned to monitoring and nothing else, IV fluids, active warming, and pain control started before the first incision rather than after your pet wakes up.
The Day
Your pet comes in during the morning, having had no food overnight — water is fine. We examine them, run the bloodwork, and call you if anything changes the plan.
Sedation goes in early, before anything uncomfortable happens, so they aren’t frightened at the point we induce. Surgery itself is usually under an hour. Someone sits with your pet while they come around, somewhere warm and quiet.
Most patients go home the same afternoon with medication, written instructions, and a number to call if anything worries you.
Recovery
Ten to fourteen days, and the hard part is not the pain — it’s the boredom.
- Keep the incision dry and covered by nothing. No bathing, no swimming, no ointment.
- Check it once a day. A thin line, slightly pink, is normal. Swelling, discharge, a gap, or a smell is not — call us.
- No licking. The cone is not a cruelty; a licked-open incision is. Soft recovery suits work well for a lot of dogs and cats if the cone is a disaster.
- Short lead walks only, no stairs where you can avoid them, no off-lead running, no rough play. This is the rule people break on about day five, when their dog suddenly feels great. Day five is exactly when the repair is still weak.
- Spays need this more than neuters. It’s abdominal surgery.
Most dogs are themselves again within 24 to 48 hours. Most cats act as if nothing happened, which is its own problem.
Two Things That Aren’t True
“It will make them fat and lazy.” Neutering lowers the calorie requirement by roughly a fifth. Pets get fat because the food bowl doesn’t change, not because of the surgery. Cut the portion slightly at the same time and nothing happens.
“She should have one litter first.” There’s no health benefit to her, and it costs her the mammary-cancer protection that spaying before the first season gives.