You pick your dog up after surgery, bring him home, and then stare at the area for a second longer than you meant to. Maybe the scrotum still looks like it is there. Maybe the incision is smaller than you expected. Maybe someone told you neutering “fixes” a dog, while someone else said it only changes hormones. For many owners, the biggest question is the simplest one of all: when a dog is neutered, do they actually remove the testicles?
The plain answer is yes. In a standard dog neuter, the veterinarian removes both testicles. That is the surgery. The testicles are the main source of testosterone, so taking them out changes fertility and lowers many hormone-driven behaviors. What throws people off is that the scrotum, the skin pouch that held the testicles, often stays in place. So after surgery, your dog may still look like he has “something there” at first, even though the testicles are gone.
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That one detail, the empty scrotum, is where much of the confusion starts. Owners expect the whole area to look flat and gone right away. Instead, the skin can still be there like an empty coin purse. In a younger dog, it often shrinks down with time. In an older dog, it may stay more noticeable. That does not mean the surgery failed. It usually just means the skin was left alone, which is common.
What “neutered” means in dogs
When people say a male dog is neutered, they usually mean a surgical castration. The medical term is orchiectomy or orchidectomy. In plain English, it means both testicles are removed. This keeps the dog from fathering puppies and lowers the body’s testosterone supply.
That is different from a vasectomy. With a vasectomy, the pathways that carry sperm are cut, but the testicles stay in place. A dog who has had a vasectomy cannot sire puppies, but he still has testosterone because the testicles are still there. Most pet dogs do not get vasectomies. The usual surgery in general practice is removal of both testicles.
This is why behavior changes after neutering are tied to hormones. Remove the testicles, and you remove the biggest source of testosterone. A dog may still act excited, still mount, or still mark in some cases, but the hormone supply drops because the testicles are no longer there doing that job.
What the surgery usually looks like
Most standard dog neuters are done under general anesthesia. Your dog is asleep, monitored, and kept on pain control. The hair around the surgery site is clipped, the skin is cleaned, and the veterinarian makes a small incision to reach and remove the testicles. Many owners imagine a dramatic surgery, but in a healthy dog with both testicles in the scrotum, it is often a routine procedure.
After the testicles are removed, the cords and blood supply are tied off, and the incision is closed. Some vets use stitches under the skin that dissolve. Some use skin glue. Some use visible stitches that need removal later. The outer look can vary a bit from one clinic to another, but the goal is the same: safe healing, low pain, and a clean closure.
What many people do not realize is that the incision may not always be made right on the scrotum in every dog. In many dogs, the opening is made just in front of it. That is another reason owners can be surprised when they look later. The scrotum can still sit there, while the actual surgical work was done through a nearby opening.
Why the scrotum may still be there after neuter
This is the part that causes the most second-guessing. Owners look, see a pouch, and think the testicles were left behind. In most cases, that is not what happened. The scrotum is skin. The testicles are the organs inside it. In a routine neuter, the testicles are removed, but the skin pouch often stays.
Right after surgery, that pouch can look puffy, loose, or a little bruised. It may even look fuller than expected because of swelling. That can make the area look like the testicles are still present. It is a little like taking grapes out of a small bag and still seeing the bag for a while afterward. The shape can linger even when the contents are gone.
Over time, the empty scrotum often shrinks. In puppies and young dogs, it may become barely noticeable. In older dogs, mainly those neutered later in life, the skin may stay more obvious. Some veterinarians will remove the scrotal sac in select cases, but that is not the standard in every dog and is not always needed.
Do they ever leave one testicle behind on purpose?
In a normal neuter, no. The plan is to remove both. A dog is not considered fully neutered if only one testicle is removed and the other is left behind. If a dog has one visible testicle and the other never descended, the veterinarian still aims to remove both. The hidden one may be in the groin or inside the abdomen, and reaching it may take a different incision or a slightly larger surgery.
This matters because a retained testicle can still make hormones and can also carry health trouble later on. So if a dog has cryptorchidism, which means one or both testicles did not descend, the full job is still removal of both testicles. The surgery just takes a different road to get there.
Owners sometimes get confused when they hear, “He only had one down.” That does not mean the vet only takes out the easy one and leaves the hidden one sitting there. A proper neuter in that case means finding and removing the retained one too.
What if the dog still looks male after surgery?
That is common, mainly in the first days or weeks. The penis stays where it was. The scrotum may still be visible. The dog may still lift his leg. He may still hump a blanket, sniff females, or act keyed up at times. None of that proves the testicles are still there.
Dogs do not become blank slates after neutering. They still have habits, nerves, memory, and old patterns. A dog who marked for a year before surgery may still mark from habit. A dog who humps from stress may still hump when guests come over. A dog can even still get an erection after neuter because blood flow and nerves are still there. The testicles are gone, but the body is not turned into a statue.
This is where many myths creep in. People expect a dog to look different overnight and behave like a brand-new animal. Real life is softer than that. Hormone-driven change can take time, and some habits are tied more to emotion and practice than to sex hormones alone.
How can you tell the surgery was done?
The clearest answer is your veterinary record. Your clinic can confirm exactly what procedure was done. If your dog had a standard neuter, both testicles were removed. If you have any doubt because of how the area looks, call the clinic and ask them to walk you through what was done and what the normal healing stage should look like.
At home, the area may give you mixed signals at first. Swelling can make the scrotum look full. Bruising can make the whole site look more dramatic than it is. In some dogs, the empty pouch hangs for a while and makes owners think, “That cannot be right.” Yet that may still be a normal look after surgery.
Signs that are worth a call include a bad smell, heavy bleeding, pus, severe swelling, constant dripping, a wide-open incision, or nonstop licking. Those signs are about healing trouble, not about whether the testicles were removed. They still matter and deserve a quick check.
What happens if a retained testicle was missed?
This is not the usual story, but it can happen. If a dog had a hidden testicle and it was not found or removed, that remaining tissue can still make testosterone. In that case, the dog may still show stronger male behavior than expected. The hidden testicle can also face higher odds of later trouble.
Owners often start asking questions when a dog was said to be neutered but still acts strongly sexual months later, or when the history includes only one descended testicle before surgery. In that kind of case, a vet exam can help sort it out. The vet may feel the groin area, review old records, or run more tests if needed.
That is different from a dog who simply still humps sometimes or still gets excited. Behavior alone does not prove there is a retained testicle. Plenty of fully neutered dogs still do those things. The full picture matters.
What changes after the testicles are removed
The biggest shift is fertility. A dog with both testicles removed cannot keep producing sperm in the normal way and cannot sire puppies in the future. Hormone levels also drop because the main testosterone source is gone. That can reduce roaming, some marking, some mounting, and some dog-to-dog friction in many males.
Still, neutering is not a magic sponge that wipes every behavior away. If a dog learned to mark the couch leg every time the neighbor dog passed the window, that habit may stay alive until you work on it. If a dog humps from excitement, he may still do it after surgery because the trigger is not fully about sex. Remove the engine’s main fuel, and the car may slow, but it does not vanish.
Health changes matter too. Removing the testicles means a dog cannot get testicular cancer later. It also changes the hormone picture tied to some prostate and hormone-linked problems. On the other hand, owners should talk with their own vet about timing, breed, age, and health, because neutering is not a one-size-fits-all talk for every dog.
What recovery usually looks like
Most dogs go home the same day. The first night can be a little sleepy, quiet, or groggy. Some dogs bounce back so fast that owners have to remind them they just had surgery. That is where the challenge starts. A dog may feel ready to run before the tissues are ready for him to run.
The incision area should be checked each day. A small amount of swelling can be normal. A little pink skin can be normal. A dog trying to lick nonstop is not helpful, even if he thinks he is “fixing” it. That is why cones, recovery collars, or other barriers are often needed. The goal is simple: keep the dog from turning a tidy little incision into a mess.
Activity is usually limited for a stretch after surgery. That means no wild zoomies, wrestling, or hard jumping while the site closes up. Owners often struggle here because the dog seems bright and ready to roll. Yet healing tissue can be like wet cement. It looks set before it truly is.
Common myths that trip owners up
One myth is that neutering means the whole scrotum disappears right away. It often does not. Another is that any mounting after surgery means the vet left the testicles in. That is not true. Mounting can still happen for many reasons after neuter.
A third myth is that neutering and vasectomy are the same thing. They are not. A standard neuter removes the testicles. A vasectomy leaves them in place. That one detail changes the whole hormone story. If your dog had a routine neuter at a general veterinary clinic, the usual procedure was removal of both testicles.
Another myth says the penis is removed. It is not. The penis stays where it belongs. What changes is the removal of the testicles and the hormone shift that follows.
The bottom line
Yes, when a dog is neutered, the veterinarian normally removes both testicles. That is what a standard dog neuter is. The reason owners get confused is that the scrotum often stays, and it may still look noticeable for a while after surgery. In some dogs, mainly older ones, that empty pouch can stay visible long after the testicles are gone.
If your dog had one or both testicles retained, the goal is still removal of both, though the surgery may need a different incision to reach the hidden one. If you ever feel unsure about what was done, the fastest answer is your vet’s record and a quick follow-up exam.
So the short version is simple, even if the healing look can fool the eye: in a normal dog neuter, the testicles are removed. The skin may stay. The dog stays himself. The surgery changes the inside more than the outside at first, which is why so many owners take one look and wonder what they are really seeing.
This article is for general reading only and does not replace care from your own veterinarian.