I’ve treated many male cats with urinary blockages over the years as a licensed veterinarian practicing small-animal medicine, and some eventually require perineal urethrostomy (PU) surgery. By the time a cat reaches that point, both the cat and the owner have usually been through repeated emergencies, sleepless nights, and more stress than they expected when they first adopted a kitten.

One of the first questions I hear after surgery isn’t about the incision or medication. It’s about behavior.

Owners want to know whether their cat will act differently. Will he still spray? Will he avoid the litter box? Will his personality change?

In my experience, most cats return to very normal behavior once they recover, but the weeks following surgery can involve some confusing changes. Understanding what is typical and what signals a problem can make that recovery much smoother.

The First Few Days: Disorientation and Quiet Behavior

Right after PU surgery, most male cats behave very differently from how they did before. This is largely due to anesthesia, pain medication, and the stress of hospitalization.

Many cats are unusually quiet.

Some hide. Others seem slightly disoriented. I’ve had owners call worried because their normally vocal cat barely made a sound for a day or two.

I remember one orange tabby brought back for a post-op check a few days after surgery. His owner was convinced something was wrong because the cat—usually extremely energetic—spent nearly two days sitting under the bed. But when we examined him, his incision looked excellent, and he was urinating normally. Within another day, he was back to chasing toys.

That early withdrawal is common. The body has gone through a major procedure, and cats tend to recover quietly.

The key behavior we look for in those first days is whether the cat urinates comfortably.

If he uses the litter box and produces urine without straining or crying, that’s a very reassuring sign.

Litter Box Habits After Surgery

The litter box is where most behavior changes appear.

PU surgery creates a wider urinary opening, allowing urine to pass more easily. While that solves the life-threatening obstruction problem, it also means the urine stream is often different.

Some cats squat lower than they used to. Others spray urine slightly backward.

I’ve had several owners worry that their cat had suddenly developed poor litter box manners when, in reality, the urine stream had simply changed direction. In a few cases, switching to a larger litter box with higher sides solved the problem immediately.

A cat I treated last winter comes to mind. His owner thought he had started urinating outside the box again, but after observing him in the clinic, we saw the issue clearly: he was using the box correctly, but the stream angled backward and hit the rim. A deeper litter box fixed the issue within a week.

Behaviorally, most cats continue to recognize the litter box without any retraining.

Increased Urination: A Temporary Phase

Many cats urinate more frequently after PU surgery during recovery.

This isn’t necessarily a behavioral issue. It’s often related to inflammation in the urinary tract or the increased water intake that many veterinarians encourage.

From the owner’s perspective, though, it can feel like a behavior change.

Cats that previously visited the litter box twice a day may suddenly go six or seven times.

I’ve seen owners panic over this, assuming the blockage is returning. In most cases, the cat is simply passing smaller amounts while the urinary tract heals.

If the cat seems comfortable and urine is flowing normally, this phase usually settles within a couple of weeks.

Personality Changes: Rare but Possible

One question I hear often is whether PU surgery changes a cat’s personality.

In my experience, the surgery itself rarely causes personality shifts. What owners often notice instead is a positive change once chronic urinary pain is gone.

Cats suffering from repeated blockages are often irritable, withdrawn, or unusually aggressive. Pain does that.

After surgery and recovery, some cats become noticeably more relaxed.

A gray domestic shorthair I treated several years ago had blocked three times before his owners elected surgery. Before the procedure, he hid constantly and swatted whenever anyone tried to pet him. A few months afterward, the owners told me he had become one of the friendliest cats in the house.

Relief from chronic discomfort can transform behavior.

Grooming and Attention to the Surgical Area

One behavior we monitor closely is excessive licking near the surgical site.

A moderate amount of grooming is normal as the area heals. Cats are meticulous animals, and they investigate anything unusual on their bodies.

But obsessive licking can cause complications.

That’s why many cats leave the clinic wearing an Elizabethan collar or a recovery suit. Owners sometimes underestimate how quickly a determined cat can irritate the surgical site.

I recall a patient whose owner removed the collar early because the cat seemed frustrated. Within a day, the cat had licked the incision enough to cause swelling and irritation. Fortunately, we caught it early and prevented infection, but it extended the recovery period.

Stress-Related Behavior During Recovery

Recovery often means temporary lifestyle changes: confinement, limited jumping, and medication schedules.

Some cats respond to that disruption with mild stress behaviors.

These can include:

• Hiding more than usual
• Reduced appetite for a few days
• Irritability when handled
• Avoiding interaction

In most cases, these behaviors fade once the cat resumes normal routines.

Cats thrive on predictability. Once the litter box, feeding schedule, and movement return to normal, their behavior usually stabilizes.

Common Mistakes Owners Make

Over the years, I’ve seen a few patterns that tend to complicate recovery.

One is changing too many things at once. Owners sometimes switch litter type, move the box, change diet, and adjust the environment simultaneously after surgery. When behavioral issues appear, it becomes difficult to determine the cause.

Another mistake is assuming every unusual behavior means the surgery failed.

Cats recovering from a major procedure will have some temporary quirks. Occasional hesitation at the litter box or mild restlessness isn’t uncommon during the healing process.

What concerns veterinarians more is persistent straining, crying during urination, or a complete lack of urine. Those symptoms deserve immediate attention.

Long-Term Behavior After PU Surgery

Once fully healed, most male cats behave exactly like they did before—often better.

The biggest long-term behavioral difference I see is reduced stress around the litter box. Cats that previously associated urination with pain sometimes relearn that the process is comfortable again.

That change alone can significantly improve their mood.

Owners occasionally report subtle differences in posture while urinating or a slightly different spray pattern, but those are mechanical changes rather than behavioral ones.

Years after surgery, many cats live completely normal lives.

I still see some of my PU patients during routine checkups long after their surgery. One in particular—a black cat I first treated several years ago—now strolls into the exam room like he owns the place. Considering how sick he was before the procedure, the transformation is remarkable.

The surgery solved a medical crisis, but what owners notice most afterward is something simpler: their cat finally seems comfortable again.