Female Dog Spaying: Pros and Cons

What the surgery involves

There are two common versions. An ovariohysterectomy removes the ovaries and the uterus, while an ovariectomy removes only the ovaries and is widely used in Europe. Both stop heat cycles and pregnancy, and some clinics offer keyhole (laparoscopic) surgery with smaller incisions.

Either way, it is an abdominal operation under general anesthesia. The clinic will give you instructions about food and water beforehand, and many vets recommend a blood test first, especially for an older dog. Most dogs go home the same day with a shaved patch and a line of stitches on the belly, and are largely recovered within two weeks.

The health benefits

The clearest benefit is protection from pyometra, a serious infection of the uterus. It usually strikes middle-aged or older unspayed females in the weeks after a heat, and without quick treatment, usually emergency surgery, it can kill. Because the infection depends on hormones from the ovaries, a properly spayed dog is protected.

Spaying also lowers the risk of mammary tumors, which are common in unspayed female dogs, and many of them are malignant. The benefit is thought to be greatest when a dog is spayed young, before her first or second heat. The size of the effect has been questioned in recent years, but most vets still count it as a major advantage.

It also removes the risk of ovarian tumors and of false pregnancy. In a false pregnancy, some unspayed females nest, produce milk and guard toys like puppies after a season, and it can happen again after every heat.

Heat cycles and unplanned litters

An unspayed female usually comes into heat about twice a year, starting somewhere between six months and two years of age, depending on her size. Each season lasts around two to three weeks, with bleeding, frequent urination and strong interest from intact males in the area. Many females try hard to get out during this time, and one escape is enough for a litter.

Where we work, unplanned litters are a serious problem. In the Balkan region, many abandoned puppies come from dogs that were never spayed or neutered and keep having litters. Clinics and shelters in the region usually refuse to admit or treat puppies below seven months of age, which is why so many of them die of disease. For that reason, every animal we rescue is neutered once it is strong enough for surgery, as our FAQ explains.

The risks and downsides

Spaying is not free of risk, and a fair picture includes the downsides. Most of them are uncommon or manageable:

• Surgery and anesthesia. Serious complications are rare in a healthy young dog, but every operation carries some risk.
• Weight gain. Spayed dogs often need fewer calories, so portions may need adjusting after the surgery.
• Urinary incontinence. A minority of spayed females leak urine later in life, often while asleep. It is more common in larger dogs and usually responds well to treatment.
• Joint problems in some large breeds. Spaying before a dog is fully grown has been associated with higher rates of certain joint problems, such as cruciate ligament tears, in several large breeds.
• Possible cancer links. Some research has linked spaying with more cases of certain cancers in particular breeds, while other research has not found the same effect.
• Coat changes. In some long-coated breeds the coat can become softer and fluffier.

The last three points depend heavily on breed and size, and the research is still developing. This is an area where vets genuinely disagree, so two good clinics can give you different advice about the same dog.

What spaying does not change

Spaying does not reliably change a dog's personality. It will not calm an anxious dog or cure reactivity, and behavior problems need training and patience rather than surgery. If your dog is nervous, our guide to helping a fearful dog is a better place to start.

A few myths are worth clearing up. A female does not need to have one litter before she is spayed, and letting her have one brings no health or behavior benefit. Weight gain after spaying is controlled with food and exercise and is not inevitable. There is also no sign that a spayed dog misses having puppies.

Choosing the timing

For years, spaying at around six months was the standard advice. Many vets now tailor the timing to the dog, and the main factor is her expected adult size:

• Small and medium dogs. Many vets still recommend spaying around six months or before the first heat, when the mammary tumor benefit is greatest and joint concerns are smaller.
• Large and giant breeds. Many vets now suggest waiting until growth has finished, which can mean a year or more, and weigh that delay against the mammary tumor risk.
• After a heat. Most vets avoid spaying during a season and wait two to three months afterward, once the reproductive organs have returned to normal.

For rescues, the priority is different. Preventing more litters comes first, and many shelters spay and neuter animals young for that reason. If you adopt a female who is already spayed, the timing question is settled, and your part is to keep her fit and at a healthy weight.

Aftercare and when to call the vet

The first two weeks matter most. Keep her calm and on a leash for bathroom breaks, and prevent running, jumping and rough play, even if she seems fully recovered after a few days. Use a cone or a recovery suit so she cannot lick the wound.

Check the incision once or twice a day. A little redness at the edges is normal at first, but it should look better each day, not worse. Give only the pain relief your vet prescribes, since several common human painkillers are poisonous to dogs.

Most dogs recover without trouble, but some signs need a professional look. Pale gums, a swollen belly or collapse can mean internal bleeding, so go to a clinic at once. Call your vet the same day if you notice any of these:

• The wound opens, swells, bleeds or leaks pus
• She has not eaten by the day after surgery, or she vomits repeatedly
• Weakness or drowsiness that is not improving by the next day
• Pain that seems to get worse as the days pass

Before you book the surgery, go in with questions: when the vet recommends spaying for a dog of her size and breed, which technique the clinic uses, and what the aftercare involves. If you are adopting from us and want to know what has already been done for a particular dog, send us an adoption inquiry. For cat owners, see our guide to spaying and neutering cats.