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If you live in Minnesota, Wisconsin, or anywhere else in the upper Midwest, you know the drill. Lake season finally rolls around, your dog spends every weekend in the water with wet ears, and by August you're on your third round of ear drops for the same recurring ear infection. Or maybe your cat has been shaking his head, tilting it to one side, or acting like one ear just will not stop bothering him. 

At some point, your vet may recommend a CT scan. For a lot of pet owners, the reaction usually lands somewhere between "that sounds serious…and expensive" and "wait, isn’t that what my grandpa had for his kidney stones?" It's a fair question. We’re here to give you a straight answer, and the research behind it.

What Is a CT Scan, and Is It Recommended for an Ear Problem?

A CT (computed tomography) scan takes hundreds of thin, cross-sectional X-ray images and stitches them into a detailed 3D picture of the inside of your pet's head. A standard X-ray flattens everything into one image, but a CT scan lets a veterinarian look at the ear canal, the eardrum, and the middle ear cavity (the tympanic bulla) layer by layer, like slicing a loaf of bread and looking at each individual piece.

Vets often recommend a CT scan when an ear problem appears to originate deeper than what an otoscope can show, or when it keeps coming back no matter what treatments have been tried.

How Common Is Chronic Ear Disease for Pets?

It is a lot more common than most owners think. Otitis externa, or simply put - inflammation of the ear canal, shows up in between 7% and 20% of dogs, depending on the study, and it's one of the top reasons dogs are brought in to see a vet. Breed and ear shape matter a lot: dogs with floppy, low-hanging ears (like Cocker Spaniels, Basset Hounds, Labradoodles, and Golden Retrievers) or more narrow canals (like Pugs and Shar Peis) tend to show up in the research as having a better chance of developing chronic ear disease.

The part that doesn't get talked about much is what happens underneath a chronic infection. In one study of 205 dogs referred for CT due to consistent symptoms of middle ear disease, a little over 40% of the scans showed concerns in the middle ear itself - fluid or debris, thickened walls, or in some cases bone changes. A lot of those dogs had been only treated for an outer ear infection for months.

That is why imaging, like a CT,  can matter so much in chronic cases. Middle ear disease isn’t always obvious from the outside. Sometimes it hides behind an ear canal that looks routine, and sometimes it is missed because the canal is too swollen or narrow to see clearly. 

What Can a CT Scan Show That an Otoscope Can't?

An otoscope is great for seeing what is happening inside the ear canal, like inflammation, discharge, debris, foreign material, or changes to the eardrum. But even with a good exam, there are limits to what can be seen from the outside. If the eardrum is intact, swollen, or difficult to see because of inflammation, the middle ear can be hidden from view. This is common in pets with ear problems that have been going on for weeks, months, or even longer. 

A CT scan gives the veterinarian a look beyond the ear canal at the areas that can’t always be seen with an otoscope, such as the area behind the eardrum. It can help identify whether the middle ear is involved and provide a better picture of what might be causing chronic or recurring ear issues.

The CT can reveal:

• Fluid or infected material trapped in the bony part of the middle ear (the tympanic bulla)

• Thickening or changes in the bulla wall, that can happen with long-term, low-grade infection

• Masses, polyps, or tumors in the ear canal or middle ear

• If soft tissue swelling is present and whether the canal has narrowed or become partially calcified

• Whether nearby areas like the base of the skull, surrounding sinuses, or in some cases, the inner ear, might also be involved

For a dog that has been treated for “just an ear infection” for a year and a half, a CT scan can be the difference between trying another round of drops and finally understanding why the problem keeps coming back. It can mean the difference between another round of ear drops and actually finding out why nothing has been working.

Signs a CT Scan Might Be the Next Step

CT isn’t usually the go-to for a simple, first-time ear infection. In many cases, an ear exam, cytology, a good cleaning, and the right medication are enough to get things under control. Vets are much more likely to recommend a scan when an ear problem is not resolving or when there might be something else going on. This can include situations where:

• An infection keeps coming back even with appropriate treatment

• Symptoms don't improve, or get worse, after a full course of medication

• The pet starts to develop a head tilt, balance issues, unusual eye movement, or other neurological changes

• The ear canal has become so swollen, narrowed, or calcified the eardrum can’t be seen clearly

• The vet suspects a mass, polyp, or abnormal tissue inside the ear canal or middle ear

• Surgery is being considered 

So, What Actually Happens During A Pet's CT Scan

The process is pretty quick and entirely painless - it's imaging, not a procedure. Here's how it typically goes:

1. Fasting. Because your pet will be under anesthesia, fasting is required for 8-12 hours before the procedure.

2. Pre-anesthetic workup. Bloodwork and a physical exam are needed to confirm your pet can safely undergo anesthesia.

3. Anesthesia. A brief general anesthesia is normal, pets need to be completely still for the duration of the scan. The scan itself usually only takes a few minutes.

4. Recovery and results. Most pets wake up quickly and will go home the same day. Images are reviewed by a radiologist and shared with your primary vet or specialist to determine a treatment plan.

What Does a Pet CT Scan Cost?

CT pricing can depend on your pet’s size, the type of scan needed, whether contrast or biopsy is involved, and who is performing the scan. In the Midwest, many veterinary CT scans range between $2,000 to $3,000+, with more complex cases sometimes costing more.

Before scheduling the scan, be sure to find out what is included in the estimate. Some locations will bundle sedation or anesthesia, bloodwork, the scan, and radiologist review, while others list each item separately.

If you have pet insurance, diagnostic imaging could be covered when it is medically recommended. 

CT Scan vs. Video Otoscopy: Why Vets Often Use Both

These tools don’t compete with each other - they answer different questions. Video otoscopy is better for seeing, cleaning, and treating the ear canal in real time; and it lets your vet show you exactly what they're seeing. CT is the better option for looking past the canal into the middle ear and surrounding bone, and for catching problems that a scope can't reach. Together, they cover what's visible and what's hidden, which is exactly why veterinarians typically use both rather than choosing one over the other.

How Haarstad Veterinary Dermatology Approaches Chronic Ear Disease

At Haarstad Veterinary Dermatology, we see a lot of pets with ear problems that have been going on for weeks, months, or sometimes even years. By the time many pets come to us, their families are frustrated, their pet is uncomfortable, and everyone is ready for better answers. 

Dr. Amy and our team use video otoscopy to examine the ear canal and eardrum, check for debris, foreign material, masses, or other concerns, and perform deep ear cleanings when needed. For pets with ears that are too painful, swollen, or narrow for a regular exam, this can be done under anesthesia to make the process safer and more comfortable.

When we suspect the problem may involve the middle ear, or when an infection is not improving with standard treatment, we might recommend a CT through a service like Mobile Veterinary CT (MVCT). Their mobile CT unit comes directly to our clinic, which helps avoid an extra trip to another vet clinic. The scan gives us a better picture of areas that are hidden during a regular exam , and the images are reviewed by a radiologist.

From there, we create a treatment plan based on what is actually causing the problem. Our goal is to stop the cycle of recurring infections, find the actual source of discomfort, and help your pet feel better for the long term.

You can learn more about our approach on our Ear Disease Management page.

Common Questions Pet Owners Ask

Will a CT scan cause any pain for my dog or cat? No. The scan itself is completely painless - your pet is under brief general anesthesia to stay still, not because it causes discomfort.

How long does a pet CT scan take? The scan usually only takes a few minutes, though the full appointment -  including anesthesia prep and recovery - will run longer.

Can a CT scan tell if my dog needs ear surgery? It can. CT is often used before ear surgery because it helps the surgeon understand how much of the ear canal, middle ear, or surrounding bone is involved. 

Is a CT scan better than an X-ray for ear problems? For ear and skull structures, yes. CT provides detail of the middle ear, bone, and soft tissue that an X-ray simply can't, which is why it's used for evaluating middle ear disease.

If your dog or cat has been dealing with ear issues that keep coming back, it may be worth a deeper look than another round of drops. Contact Haarstad Veterinary Dermatology to talk through whether advanced imaging makes sense for your pet's specific case.