Good News: Mild Chiari Malformation Doesn’t Seem to Steal Your Pomeranian’s Hearing
If your Pomeranian has been diagnosed with Chiari-like malformation, you may have worried about what else could go wrong — including hearing loss. But a new study published in Frontiers in Veterinary Science brings some welcome reassurance: Pomeranian hearing was not significantly affected in dogs with mild cases of this condition. Researchers compared brain-based hearing tests in 42 Pomeranians — some with the condition, some without — and found no meaningful difference in the results.
That’s important news for owners of affected dogs. A diagnosis of Chiari-like malformation can feel overwhelming, and it’s natural to assume the worst. This study suggests you don’t need to automatically add hearing loss to your list of concerns — at least for mild cases.
What Is Chiari-Like Malformation, and Why Does Hearing Matter?
Chiari-like malformation (often abbreviated CLM) is a condition where the back of the skull is slightly too small for the brain inside it. Imagine trying to pack too much into a small bag — the contents get squeezed toward the opening. In dogs with CLM, the lower part of the brain gets pushed toward the spinal canal. This can cause neck pain, scratching at the neck or ears, and in some cases a fluid buildup in the spinal cord called syringomyelia (say: sir-in-go-my-EE-lee-ah) — essentially a pocket of fluid that forms inside the spinal cord due to the pressure.
Pomeranians, like many small and toy breeds with rounded, dome-shaped skulls, are prone to this condition. The hearing concern comes from the fact that the same brain pathways that process sound run right through the region affected by CLM. Researchers wanted to know whether that pressure and crowding might disrupt the hearing signals traveling from the ears to the brain.
How the Study Was Done
The researchers used two tools side by side: MRI scans and a BAER test.
MRI (magnetic resonance imaging) is the same type of scan used in human medicine — a machine creates detailed pictures of the inside of the body without using X-rays. In this study, MRI scans were used to confirm whether each dog had Chiari-like malformation and to assess how severe it was.
BAER test stands for Brainstem Auditory Evoked Response. Think of it like measuring the electrical “echo” your brain produces when it hears a sound. Small electrodes are placed on the dog’s scalp, a series of clicks are played into each ear, and sensors record the brain’s response. The timing and shape of those responses tell the vet how well the hearing pathway is working — from the ear all the way through the brain. It’s completely painless and doesn’t require any cooperation from the dog.
The study included 42 Pomeranians total: 32 dogs diagnosed with mild Chiari-like malformation and 10 healthy dogs without the condition (the control group). Researchers then compared the BAER results between the two groups to see if there were any differences.
What the Study Found
No Significant Difference in Hearing Test Results
The main finding is straightforward: the timing of the hearing signals — called response latencies — did not differ in a meaningful way between the dogs with CLM and the healthy dogs. In other words, the electrical “echo” of sound traveled through the brainstem at the same speed whether or not the dog had the malformation.
This is encouraging. It suggests that mild Chiari-like malformation, on its own, does not appear to disrupt the hearing pathway in Pomeranians.
What “Mild” Means Here
It’s worth noting that this study focused specifically on mild cases of CLM. Dogs with more severe malformation — or dogs who also have syringomyelia — were not the focus of this research. The findings apply mainly to Pomeranians in the earlier or less severe stages of the condition. Whether more advanced cases might show a different picture is still an open question.
What This Means for Your Pomeranian
Don’t Assume the Worst — But Stay Alert
If your Pomeranian has been diagnosed with mild Chiari-like malformation, this study says: don’t automatically assume your dog is losing their hearing. The brain’s hearing machinery appears to keep working normally in mild cases.
That said, the researchers were careful to point out that this doesn’t give anyone a free pass to ignore hearing concerns. Dogs can’t tell you when they’ve stopped hearing as well as they used to. If you notice your Pomeranian seems less responsive — not coming when called, being startled by things they used to notice, or seeming more confused about sounds — those changes deserve a proper evaluation.
Practical Steps for Owners
Here are a few things you can do at home and with your vet:
- Watch for behavioral changes — Does your dog respond differently to familiar sounds, like their name or a treat bag rattling? Keep a mental note of any shifts.
- Ask your vet about a BAER test — If you notice changes in responsiveness, a hearing test is quick, painless, and can give you clear answers. You don’t need to wait until things seem serious.
- Keep up with neurological check-ins — If your dog has CLM, regular vet visits to monitor progression are a good idea regardless of hearing concerns.
- Don’t skip the diagnosis — CLM exists on a spectrum. Getting proper imaging done helps your vet understand where your dog falls on that spectrum and what to watch for.
When to Call Your Veterinarian
Contact your vet promptly if your Pomeranian:
- Stops responding to their name or familiar commands
- Seems startled when you approach from behind (which can signal reduced hearing)
- Scratches frequently at the neck, ears, or face (a classic CLM symptom)
- Cries or yelps for no obvious reason, especially when touching the neck area
- Shows changes in balance or coordination
Study Limitations Worth Knowing
This was a pilot study — a small, early-stage investigation designed to explore whether there’s a relationship worth studying further. With 42 dogs total, the sample size is modest. Small studies like this are valuable for pointing researchers in the right direction, but they can’t tell us the full story.
Because the study only looked at mild CLM, we can’t draw conclusions about dogs with moderate or severe cases, or dogs who also have syringomyelia. The findings may not apply to all breeds with similar skull shapes, either. Larger follow-up studies across more dogs, more breeds, and wider ranges of disease severity will be needed to build a more complete picture.
The Bottom Line
A Pomeranian hearing test coming back normal, even in a dog with mild Chiari-like malformation, is entirely plausible — and this study supports that. The electrical signals that carry sound from the ear to the brain appeared unaffected in the mild CLM dogs studied. That’s reassuring, but it doesn’t mean you should ignore hearing concerns if they arise.
Think of it this way: a mild case of CLM doesn’t automatically mean your dog’s hearing is at risk, but it does mean staying tuned in to how your dog responds to the world around them. If something seems off, a quick BAER test can give you peace of mind — or catch a problem early when it’s easier to manage.
This article summarizes peer-reviewed research for educational purposes. Always consult with your veterinarian for personalized advice about your pet’s health and behavior.