Chiari-like Malformation and Syringomyelia
Understanding Chiari-like Malformation and Syringomyelia: One of the Most Important Health Challenges Affecting the Cavalier King Charles Spaniel
If you are researching the Cavalier King Charles Spaniel, considering purchasing a Cavalier King Charles Spaniel puppy, or already share your life with one of these beautiful dogs, understanding Chiari-like Malformation and Syringomyelia is essential.
These neurological conditions are among the most significant inherited health challenges affecting the breed and have been the focus of extensive veterinary research for more than two decades. While not every Cavalier King Charles Spaniel will develop clinical signs, the breed has a much higher risk than almost any other dog breed, making responsible breeding, MRI screening and owner education critically important.
The good news is that veterinary specialists, responsible breeders and breed clubs around the world are working together to improve the long-term neurological health of the Cavalier King Charles Spaniel. Through MRI screening, careful breeding decisions and ongoing research, significant progress is being made towards reducing the incidence and severity of these inherited conditions.
Whether you are searching for a Cavalier King Charles Spaniel puppy in Queensland, looking for a responsible Cavalier breeder, or simply wanting to better understand your own dog's health, learning about Chiari-like Malformation and Syringomyelia will help you make informed decisions and provide the very best care throughout your Cavalier's life.
Overview
Condition: Chiari-like Malformation and Syringomyelia
Body system affected: Brain, spinal cord and nervous system
Inherited? Yes. Both conditions have a strong inherited (genetic) component.
Can it be prevented? Not completely, but responsible breeding and MRI screening can significantly reduce the risk of producing severely affected puppies.
Can it be cured? No. There is currently no cure, although many dogs can be successfully managed with medication and, in selected cases, surgery.
Health screening available? Yes. MRI scanning is currently the gold standard for assessing breeding dogs.
What is Chiari-like Malformation?
Chiari-like Malformation is a developmental abnormality affecting the skull and the back of the brain. In a healthy dog, the skull provides sufficient space for the brain to sit comfortably while allowing cerebrospinal fluid to circulate freely around the brain and spinal cord. Cerebrospinal fluid acts as a protective cushion, delivering nutrients and removing waste products while helping maintain normal pressure within the central nervous system.
In dogs affected by Chiari-like Malformation, the back portion of the skull is too small or has developed abnormally. As a result, the brain becomes crowded within the skull. This overcrowding interferes with the normal movement of cerebrospinal fluid and creates abnormal pressure around the brain and upper spinal cord.
Veterinary neurologists often describe this as a "mismatch" between the size of the brain and the available space within the skull. Importantly, Chiari-like Malformation itself is extremely common in Cavalier King Charles Spaniels. However, not every dog with Chiari-like Malformation will develop symptoms or progress to Syringomyelia.
What is Syringomyelia?
While Chiari-like Malformation affects the skull, Syringomyelia is a condition affecting the spinal cord. Because Chiari-like Malformation disrupts the normal flow of cerebrospinal fluid, abnormal pressure waves can develop within the spinal cord. Over time, these pressure changes may cause fluid-filled cavities—known as syrinxes—to develop within the spinal cord itself.
These syrinxes can enlarge over time and damage delicate nerve tissue. It is this damage that causes the neurological signs and chronic pain associated with Syringomyelia. Some Cavaliers develop only small syrinxes that never cause obvious clinical signs. Others may develop larger syrinxes associated with persistent pain, altered sensation and progressive neurological dysfunction. The severity of symptoms varies enormously between individual dogs.
How Are Chiari-like Malformation and Syringomyelia Connected?
Although they are often discussed together, Chiari-like Malformation and Syringomyelia are not the same condition. Instead, they are closely related. Think of Chiari-like Malformation as the underlying anatomical problem. Because the skull is too small for the brain, normal cerebrospinal fluid circulation becomes disrupted. Over time, this abnormal fluid movement can lead to the formation of syrinxes within the spinal cord. These fluid-filled cavities are what define Syringomyelia.
In simple terms:
Chiari-like Malformation → disrupted cerebrospinal fluid flow → Syringomyelia may develop.
However, it is important to understand that:
Many Cavaliers have Chiari-like Malformation but never develop Syringomyelia.
Some dogs develop Syringomyelia without showing obvious symptoms.
The size of a syrinx does not always predict how painful the condition will be.
Every dog is different.
Why Are Cavalier King Charles Spaniels So Prone to Chiari-like Malformation?
Chiari-like Malformation is considered an inherited developmental condition. Research suggests that the condition became established within the breed over many generations as the modern Cavalier King Charles Spaniel developed its distinctive appearance, including its rounded head, large eyes and relatively short muzzle. The inheritance is complex and polygenic, meaning it is influenced by multiple genes rather than a single defective gene.
This is important because:
There is currently no DNA test for Chiari-like Malformation.
The condition cannot simply be "bred out" in a single generation.
Responsible breeding requires careful long-term planning.
Although almost all Cavaliers have some degree of Chiari-like Malformation, veterinary researchers have demonstrated that MRI screening and informed breeding decisions can help reduce the risk of producing puppies with more severe disease.
Does Every Cavalier Develop Syringomyelia?
No. This is one of the biggest misconceptions surrounding the condition. Although Chiari-like Malformation is extremely common in the breed, not every Cavalier King Charles Spaniel develops Syringomyelia, and not every dog diagnosed with Syringomyelia experiences pain or neurological signs. Some Cavaliers live their entire lives without developing clinical symptoms. Others may not show signs until adulthood or later in life.
Unfortunately, it is impossible to predict with certainty which puppies will eventually become affected. This uncertainty is one of the reasons why responsible breeding programmes rely on MRI screening of breeding dogs rather than simply observing whether they appear healthy.
Can Puppies Be Born with Chiari-like Malformation?
Yes. Chiari-like Malformation develops as the skull forms and is present from an early age, although the degree of severity varies between individual dogs.
However, Syringomyelia usually develops over time rather than being present at birth. Some Cavaliers develop syrinxes while they are still young, whereas others may not develop them until several years later. Because the disease progresses over time, MRI screening of breeding dogs is usually performed once they have reached an appropriate age, allowing veterinary specialists to better assess their long-term neurological health.
What Causes Chiari-like Malformation and Syringomyelia?
One of the most important things prospective owners should understand is that Chiari-like Malformation and Syringomyelia are not caused by poor nutrition, inadequate exercise or anything an owner has done wrong. These are inherited conditions with a strong genetic basis. However, while genetics plays the primary role, responsible breeding decisions can influence how frequently severe disease occurs within future generations.
Ethical breeders work to reduce the incidence of inherited neurological disease by:
MRI screening breeding dogs.
Following internationally recognised breeding recommendations.
Carefully evaluating the MRI results of potential breeding dogs.
Considering the neurological health of parents, grandparents and siblings.
Selecting breeding combinations designed to reduce inherited risk.
Remaining informed about the latest veterinary research.
By contrast, breeding without MRI screening means breeders have no objective way of assessing whether their dogs are affected by Chiari-like Malformation or Syringomyelia. This can increase the likelihood of perpetuating inherited neurological disease and makes it far more difficult to improve the long-term health of the breed.
Why Responsible Breeding Matters
No responsible breeder can promise that a Cavalier King Charles Spaniel puppy will never develop Chiari-like Malformation or Syringomyelia. The science simply does not support such guarantees. However, responsible breeders can significantly improve the odds by following evidence-based health screening protocols and making informed breeding decisions. Every puppy purchased from a breeder who invests in MRI screening, health testing and responsible breeding practices helps support decades of veterinary research aimed at improving the health of future generations of Cavalier King Charles Spaniels.
Choosing a responsibly bred puppy is therefore about far more than protecting your own dog. It also helps encourage ethical breeding, reduces demand for puppies bred without appropriate health screening and supports the long-term preservation of one of the world's most beloved companion breeds.
Recognising the Symptoms, Understanding the Diagnosis and Living with Chiari-like Malformation and Syringomyelia
One of the greatest challenges with Chiari-like Malformation and Syringomyelia is that the disease can be difficult to recognise in its early stages. Some affected Cavalier King Charles Spaniels show obvious signs of pain and neurological dysfunction, while others may have no outward symptoms despite significant changes visible on MRI scans.
For this reason, every Cavalier owner should understand the early warning signs, know when to seek veterinary advice and appreciate why MRI screening remains such an important tool in protecting the future of the breed.
What Are the Early Warning Signs of Chiari-like Malformation and Syringomyelia?
The first signs of Chiari-like Malformation and Syringomyelia are often subtle. They may develop gradually over months or even years, making them easy to overlook or dismiss as normal behaviour.
Early warning signs can include:
Intermittent scratching around the neck or shoulders.
Scratching at the air beside the neck without making skin contact ("air scratching").
Increased sensitivity when touched around the head, ears or neck.
Rubbing the face against furniture or the floor.
Occasional unexplained yelping or crying out.
Becoming reluctant to wear a collar.
Reduced enthusiasm for exercise.
Hesitation before jumping on furniture or climbing stairs.
Changes in sleeping position or increased restlessness.
Mild weakness or clumsiness.
Because these signs are often intermittent, many owners do not immediately realise their dog may be experiencing neurological pain.
What Is "Air Scratching"?
One of the most recognised signs of Syringomyelia is air scratching. Unlike normal scratching, the dog's foot repeatedly scratches beside the neck or shoulder without actually making contact with the skin.
Air scratching often occurs:
while walking
during excitement
when on lead
when a collar touches the neck
after waking
Not every Cavalier with Syringomyelia will air scratch, and air scratching can occasionally occur for reasons unrelated to neurological disease. However, because it is so strongly associated with Syringomyelia in Cavaliers, it should always be discussed with your veterinarian.
Common Symptoms of Syringomyelia
Every dog experiences the condition differently. Some Cavaliers remain mildly affected throughout life, while others develop significant neurological disease.
Symptoms may include:
Neck pain.
Shoulder pain.
Ear sensitivity.
Facial rubbing.
Air scratching.
Unexplained vocalisation.
Reluctance to jump.
Difficulty climbing stairs.
Weakness in the limbs.
Abnormal gait.
Muscle wasting in advanced cases.
Curvature of the spine (scoliosis).
Reduced willingness to exercise.
Difficulty settling comfortably.
Behavioural changes associated with chronic pain.
Symptoms often become worse during periods of excitement or increased activity.
Is Syringomyelia Painful?
Yes. Syringomyelia is widely recognised as a painful neurological condition. The pain results from damage to the spinal cord and abnormal stimulation of sensory nerves. Veterinary neurologists describe this as neuropathic pain, which differs from the pain caused by injury or inflammation.
Affected dogs may experience:
Persistent neck pain.
Sharp episodes of pain.
Increased sensitivity to touch.
Burning or tingling sensations caused by abnormal nerve function.
Discomfort around the ears or shoulders.
Difficulty finding a comfortable sleeping position.
Disturbed sleep.
Anxiety associated with chronic discomfort.
Some dogs cope remarkably well despite significant MRI findings, while others experience severe pain even when MRI changes appear relatively modest. This is why MRI results and clinical signs must always be interpreted together.
Can Chiari-like Malformation and Syringomyelia Affect Quality of Life?
Potentially, yes. Without appropriate treatment, severe Syringomyelia can have a substantial impact on a dog's quality of life.
Dogs experiencing chronic pain may:
become quieter than usual
avoid physical activity
withdraw from family interaction
sleep more frequently
appear anxious
become reluctant to be handled around the head or neck
Fortunately, many Cavaliers respond well to appropriate medical management and continue to enjoy excellent quality of life for many years. Early diagnosis and ongoing veterinary care play an important role in achieving the best possible outcome.
When Should You See a Veterinarian?
You should arrange a veterinary examination if your Cavalier develops:
unexplained scratching around the neck
repeated air scratching
neck pain
sudden yelping without obvious cause
reluctance to jump
facial rubbing
weakness
changes in gait
unusual sensitivity around the head or neck
These signs do not automatically mean your dog has Chiari-like Malformation or Syringomyelia, but they should always be investigated. Early diagnosis often allows treatment to begin sooner, helping maintain comfort and quality of life.
How Are Chiari-like Malformation and Syringomyelia Diagnosed?
Diagnosis usually begins with a detailed history and physical examination by your veterinarian. If neurological disease is suspected, referral to a veterinary neurologist is generally recommended. The neurologist will perform a comprehensive neurological examination before recommending further testing.
MRI Is the Gold Standard
The only reliable way to diagnose Chiari-like Malformation and Syringomyelia is through Magnetic Resonance Imaging (MRI).
MRI provides detailed images of the brain and spinal cord, allowing specialists to assess:
the shape of the skull
overcrowding of the brain
cerebrospinal fluid flow
the presence of syrinxes
the size and location of syrinxes
the severity of disease
Currently, there is:
no blood test
no DNA test
no X-ray
no CT scan
that can accurately diagnose these conditions. MRI remains the gold standard for both clinical diagnosis and responsible breeding programmes.
Why MRI Screening Matters for Breeding Dogs
One of the challenges with Chiari-like Malformation is that many affected dogs appear completely healthy. Similarly, some Cavaliers with Syringomyelia show no outward symptoms despite significant abnormalities visible on MRI. Without MRI screening, breeders have no objective way of determining whether apparently healthy breeding dogs are affected.
Responsible breeders therefore use MRI scans to:
better understand the neurological health of breeding dogs
make informed breeding decisions
reduce the likelihood of producing severely affected puppies
contribute to the long-term improvement of the breed
MRI screening is one of the most important health investments a responsible Cavalier breeder can make.
Can Chiari-like Malformation or Syringomyelia Be Cured?
Unfortunately, no. There is currently no cure for either Chiari-like Malformation or Syringomyelia.
Treatment focuses on:
relieving pain
slowing progression where possible
maintaining neurological function
improving quality of life
Many Cavaliers continue living happy, active lives for years following diagnosis.
How Is Syringomyelia Treated?
Treatment is tailored to each individual dog and depends on the severity of clinical signs.
Management may include:
medications for neuropathic pain
pain relief
medications that reduce cerebrospinal fluid production
anti-inflammatory medication where appropriate
lifestyle modifications
surgery in selected cases
Treatment plans should always be developed by a veterinarian or veterinary neurologist. Owners should never begin or discontinue medication without veterinary advice.
Can Surgery Help?
For some dogs, yes. Surgical treatment aims to reduce pressure at the back of the skull and improve the flow of cerebrospinal fluid. However, surgery is generally reserved for carefully selected cases.
While some dogs experience significant improvement, surgery:
is not suitable for every patient
does not guarantee permanent resolution
cannot reverse existing spinal cord damage
may not prevent recurrence
A veterinary neurologist is best placed to advise whether surgery is appropriate.
Living with a Cavalier Diagnosed with Syringomyelia
Receiving a diagnosis of Syringomyelia can be overwhelming. However, many owners are reassured to discover that numerous Cavaliers continue to enjoy fulfilling lives following diagnosis.
Successful long-term management often includes:
regular veterinary examinations
periodic neurological reviews
lifelong medication where required
careful observation of symptoms
maintaining a healthy body weight
avoiding obesity
using a well-fitted harness instead of a neck collar
modifying exercise when appropriate
Many owners become highly skilled at recognising subtle changes in comfort and adjusting management accordingly.
What Commitment Is Involved?
Managing Chiari-like Malformation and Syringomyelia requires ongoing commitment.
Owners should be prepared for:
specialist consultations
MRI examinations
ongoing medication
regular veterinary reviews
home monitoring
potential adjustments to treatment over time
The financial cost varies considerably depending on disease severity and the treatment required.
Responsible Breeding, Choosing a Healthy Cavalier Puppy and Frequently Asked Questions
One of the most important messages prospective owners should take away from this guide is that responsible breeding matters. While no breeder can guarantee that a Cavalier King Charles Spaniel puppy will never develop Chiari-like Malformation or Syringomyelia, ethical breeders can significantly reduce the likelihood of producing severely affected puppies by following evidence-based health screening protocols and making informed breeding decisions.
Every decision made by a breeder has the potential to influence the future health and welfare of this much-loved breed.
How Responsible Breeding Helps Protect the Breed
Unlike some inherited diseases that can be identified through a simple DNA test, Chiari-like Malformation and Syringomyelia are complex conditions influenced by multiple genes. This means there is currently no single genetic test that can identify whether a dog will develop these conditions or pass them on to future generations.
Instead, responsible breeders rely on a combination of:
MRI screening
Veterinary specialist advice
Knowledge of pedigrees
The neurological health of parents, grandparents and siblings
International breeding recommendations
Long-term breeding strategies
This approach does not eliminate the risk completely, but it helps reduce the frequency of severe disease over time. Improving the neurological health of the Cavalier King Charles Spaniel is a long-term commitment that requires careful planning across multiple generations.
Why MRI Screening Is So Important
MRI screening is currently the most reliable method available for assessing breeding dogs for Chiari-like Malformationand Syringomyelia. Importantly, MRI scans can identify abnormalities that are impossible to detect during a routine veterinary examination.
A dog may:
appear perfectly healthy
have no visible symptoms
never scratch
exercise normally
behave completely normally
yet still have significant changes visible on MRI. This is why responsible breeders invest in MRI screening before making breeding decisions. Without MRI screening, breeders simply cannot know the neurological status of their breeding dogs.
Questions Every Puppy Buyer Should Ask a Breeder
If you are searching for a Cavalier King Charles Spaniel puppy, asking informed questions is one of the best ways to identify an ethical and responsible breeder. We recommend asking:
Have both parents undergone MRI screening for Chiari-like Malformation and Syringomyelia?
A responsible breeder should be able to explain when the MRI scans were performed and what the results showed.
May I see the MRI certificates?
Responsible breeders are generally happy to provide copies of health certificates and explain what the MRI grades mean. If a breeder refuses to provide documentation, consider this a significant warning sign.
At what age were the MRI scans performed?
Age is important because Syringomyelia can develop over time. MRI screening performed at an appropriate age provides more meaningful information for breeding decisions.
Do you follow recognised breeding recommendations?
Responsible breeders should be familiar with internationally recognised breeding recommendations for Chiari-like Malformation and Syringomyelia. They should be able to explain how MRI results influence their breeding programme.
What is the neurological history of the parents and grandparents?
Because these conditions have a strong inherited component, family history is extremely valuable. Ethical breeders often have detailed knowledge of the health of previous generations.
What Are the Red Flags?
Be cautious if a breeder says:
❌ "I've never had a problem."
❌ "My dogs don't scratch, so they don't need MRI scans."
❌ "MRI screening is too expensive."
❌ "The parents are healthy."
❌ "I've been breeding Cavaliers for years without MRI."
❌ "My veterinarian says they're fine."
Although routine veterinary examinations are extremely important, only MRI can accurately assess Chiari-like Malformation and Syringomyelia. Healthy appearance alone does not indicate neurological health.
Can You Prevent Chiari-like Malformation or Syringomyelia?
At present, these conditions cannot be completely prevented. However, there are important steps prospective owners can take to reduce the risk of purchasing a severely affected puppy.
These include:
Choosing an ethical breeder.
Asking about MRI screening.
Requesting copies of health certificates.
Avoiding breeders who dismiss the importance of health testing.
Being prepared to wait for a responsibly bred puppy.
Choosing a breeder based solely on convenience, price or immediate availability may increase the likelihood of supporting breeding programmes that do not prioritise health.
Does Every Cavalier Need an MRI?
Not necessarily.
MRI is recommended when:
a dog develops neurological signs
a veterinary neurologist recommends further investigation
a breeder is assessing dogs for breeding
Routine MRI screening is not generally recommended for every healthy pet Cavalier. However, owners should remain vigilant for clinical signs throughout their dog's life and seek veterinary advice if concerns arise.
Living Positively with Chiari-like Malformation or Syringomyelia
Although these diagnoses can sound frightening, it is important to remember that many Cavaliers with Chiari-like Malformation or Syringomyelia continue to enjoy wonderful quality of life.
With advances in veterinary neurology, improved pain management and earlier diagnosis, many affected dogs live comfortably for years following diagnosis. Working closely with your veterinarian or veterinary neurologist allows treatment plans to be tailored to your dog's individual needs. The goal is always to minimise discomfort while helping your Cavalier continue enjoying family life.
Frequently Asked Questions
Can a Cavalier King Charles Spaniel have Chiari-like Malformation without Syringomyelia?
Yes. Many Cavaliers have Chiari-like Malformation but never develop Syringomyelia.
Does every Cavalier with Syringomyelia experience pain?
No. The severity of clinical signs varies enormously. Some dogs experience only mild discomfort, while others develop significant chronic neuropathic pain.
Is Chiari-like Malformation hereditary?
Yes. Current evidence strongly supports that Chiari-like Malformation has a significant inherited (genetic) component.
Is there a DNA test?
No. Unlike some inherited diseases affecting Cavaliers, there is currently no DNA test for Chiari-like Malformation or Syringomyelia. MRI remains the gold standard for assessing breeding dogs.
Should I buy a puppy from parents that have not had MRI scans?
The Cavalier King Charles Spaniel Club of Queensland strongly encourages prospective owners to choose breeders who undertake recommended MRI screening as part of a comprehensive health-testing programme. MRI screening provides valuable information that cannot be obtained through physical examination alone and supports responsible breeding decisions.
Can affected Cavaliers still enjoy a happy life?
Yes. Many Cavaliers diagnosed with Chiari-like Malformation or Syringomyelia respond well to treatment and continue to enjoy happy, active lives with their families.
The Future of the Breed Depends on Responsible Choices
The Cavalier King Charles Spaniel is one of the world's most affectionate and devoted companion dogs. Protecting the future of this remarkable breed depends on informed decisions made by breeders, owners and puppy buyers alike.
Every puppy purchased from a breeder who invests in MRI screening, specialist health testing and responsible breeding practices helps support decades of veterinary research aimed at improving the long-term neurological health of Cavaliers.
Conversely, purchasing puppies from breeders who ignore recommended health screening perpetuates demand for breeding programmes that lack the information needed to make informed neurological breeding decisions.
By choosing an ethically and responsibly bred Cavalier King Charles Spaniel puppy, you are doing far more than selecting your next family companion, you are helping safeguard the future health, welfare and genetic integrity of the breed for generations to come.
In Conclusion
Chiari-like Malformation is an inherited abnormality affecting the skull and brain.
Syringomyelia develops when abnormal cerebrospinal fluid flow leads to fluid-filled cavities within the spinal cord.
Not every Cavalier with Chiari-like Malformation develops Syringomyelia.
MRI is the gold standard for diagnosing both conditions and assessing breeding dogs.
There is currently no cure, but many affected Cavaliers enjoy an excellent quality of life with appropriate treatment.
Responsible breeding and MRI screening are the best tools currently available to reduce the incidence of severe inherited neurological disease.
Choosing a breeder who undertakes comprehensive health testing helps protect both your future puppy and the long-term health of the Cavalier King Charles Spaniel.
If you are searching for a Cavalier King Charles Spaniel puppy in Queensland or Australia, begin your search with breeders who openly discuss Chiari-like Malformation, Syringomyelia and all recommended health testing.
Ask to see MRI certificates, learn about the health of the puppy's family and never be afraid to ask questions. A responsible breeder will welcome your interest, proudly share their health-testing results and place the lifelong health and welfare of every Cavalier above making a sale.
Read: Questions to ask Breeders
References
Rusbridge C, Knowler SP. Chiari-like Malformation and Syringomyelia in the Cavalier King Charles Spaniel: Current Understanding and Breeding Recommendations.
Parker JE, Rusbridge C, et al. British Veterinary Association/Kennel Club Chiari-like Malformation and Syringomyelia Health Scheme.
British Veterinary Association. Chiari-like Malformation and Syringomyelia Screening Scheme.
The Kennel Club (UK). Chiari-like Malformation and Syringomyelia Health Information.
CavalierHealth.org. Syringomyelia and Chiari-like Malformation Information Library.
Multiple peer-reviewed studies published in Journal of Veterinary Internal Medicine, Veterinary Record and other leading veterinary neurology journals relating to Chiari-like Malformation and Syringomyelia in Cavalier King Charles Spaniels.
Disclaimer
The information provided in the Cavalier Knowledge Centre is intended for general educational purposes only and is not a substitute for veterinary advice, diagnosis or treatment.