MRI Screening Explained for Cavalier King Charles Spaniels

Magnetic Resonance Imaging (MRI) is one of the most valuable diagnostic tools available for assessing the brain and spinal cord of Cavalier King Charles Spaniels. It plays an important role in diagnosing Chiari-like Malformation (CM)and Syringomyelia (SM)—two neurological conditions that occur more commonly in this breed than in most others.

MRI screening is used for two primary purposes:

  • To diagnose Cavaliers showing signs of neurological disease.

  • To assist responsible breeders in making informed breeding decisions.

Although an MRI cannot guarantee a dog will never develop neurological disease, it provides valuable information that supports both clinical care and responsible breeding programs.

What Is an MRI?

Magnetic Resonance Imaging (MRI) is an advanced diagnostic imaging technique that produces highly detailed images of soft tissues inside the body.

Unlike X-rays or CT scans, MRI is particularly effective for examining the:

  • Brain

  • Spinal cord

  • Nerves

  • Cerebrospinal fluid (CSF)

These structures cannot be adequately assessed using standard radiographs.

Why Are Cavaliers Screened?

Cavalier King Charles Spaniels have a higher prevalence of Chiari-like Malformation (CM) and Syringomyelia (SM)than many other breeds.

MRI allows veterinarians to:

  • Confirm a diagnosis

  • Assess the severity of disease

  • Guide treatment decisions

  • Monitor progression when required

  • Assist breeders with evidence-based breeding decisions

Understanding Chiari-like Malformation (CM)

Chiari-like Malformation is a structural abnormality where the back of the skull is too small for the brain. This may disrupt the normal flow of cerebrospinal fluid around the brain and spinal cord.

Importantly:

  • Many Cavaliers have CM.

  • Not every dog with CM develops Syringomyelia.

  • Some dogs with CM never develop clinical signs.

MRI is currently the only reliable way to diagnose Chiari-like Malformation.

Understanding Syringomyelia (SM)

Syringomyelia occurs when fluid-filled cavities, known as syrinxes, develop within the spinal cord.

Clinical signs vary considerably and may include:

  • Neck pain

  • Sensitivity around the head or shoulders

  • Scratching near the neck without making skin contact ("phantom scratching")

  • Facial rubbing

  • Reluctance to jump

  • Reduced willingness to exercise

  • Weakness in severe cases

Some dogs with MRI-confirmed Syringomyelia show no outward clinical signs, while others may experience significant discomfort.

When Is an MRI Recommended?

Your veterinarian or veterinary neurologist may recommend an MRI if your Cavalier shows neurological signs such as:

  • Persistent neck pain

  • Phantom scratching

  • Facial rubbing

  • Unexplained yelping

  • Weakness

  • Poor coordination

  • Balance problems

  • Seizure investigation

  • Other neurological abnormalities

MRI helps determine whether these signs are caused by CM, SM or another neurological condition.

MRI Screening for Breeding Dogs

Many responsible breeders choose to MRI screen breeding dogs as part of a broader health testing program.

MRI results may be considered alongside:

  • Cardiac examinations

  • Eye examinations

  • DNA testing

  • Patella assessments

  • General health

Screening helps breeders make informed decisions aimed at improving the long-term health of the breed. Because breeding recommendations differ between countries, breeders should always follow the current health guidelines published by their national breed club and canine governing body.

What Happens During an MRI?

MRI is performed under general anaesthesia or, in some cases, deep sedation. This is necessary because even very small movements can reduce image quality.

During the procedure:

  • Your dog is carefully monitored by veterinary professionals.

  • The scan itself is painless.

  • Multiple detailed images are obtained.

  • A specialist interprets the results.

Most dogs return home the same day or after a short period of observation.

Is MRI Safe?

Modern veterinary anaesthesia is considered very safe for healthy dogs when performed by experienced veterinary professionals. Before the procedure, your veterinarian will assess your dog's overall health to ensure anaesthesia is appropriate. Although every anaesthetic carries some risk, complications are uncommon.

Does Every Cavalier Need an MRI?

No. MRI is not recommended as a routine screening test for every pet Cavalier.

Most companion dogs will never require an MRI unless they develop neurological signs or their veterinarian believes further investigation is warranted. For breeding dogs, MRI screening may form part of a responsible health testing program depending on the recommendations of the relevant breed club or canine organisation.

Can an MRI Predict the Future?

No.

An MRI provides information about your dog's condition at the time the scan is performed.

It cannot guarantee whether:

  • Disease will progress.

  • Clinical signs will develop later.

  • Future generations will be unaffected.

MRI results should always be interpreted alongside clinical examinations, pedigree information and other health screening results.

Frequently Asked Questions

What is MRI screening?

MRI screening uses magnetic resonance imaging to examine the brain and spinal cord. It is the most reliable method for diagnosing Chiari-like Malformation and Syringomyelia.

Does every Cavalier need an MRI?

No. MRI is usually recommended only when neurological disease is suspected or as part of selected breeding health programs.

Is MRI painful?

No. The scan itself is completely painless. Dogs are placed under general anaesthesia or deep sedation so they remain still during the procedure.

Can MRI cure Syringomyelia?

No. MRI is a diagnostic tool. It helps veterinarians diagnose neurological disease and plan the most appropriate treatment.

Should breeding dogs have MRI screening?

Many responsible breeders include MRI screening within their health testing program. Requirements and recommendations vary between countries, so breeders should follow the advice of their national breed club and veterinary specialists.

In Conclusion…

  • MRI is the gold standard for diagnosing Chiari-like Malformation and Syringomyelia.

  • MRI provides detailed images of the brain and spinal cord.

  • The scan is painless but requires general anaesthesia or deep sedation.

  • MRI assists both diagnosis and responsible breeding.

  • Screening recommendations vary internationally.

Related Articles

References

  1. British Veterinary Association. Guidance on hereditary disease screening and responsible breeding.

  2. European Society of Veterinary Neurology. Clinical guidance on Chiari-like Malformation and Syringomyelia.

  3. Rusbridge C, Knowler SP. Chiari-like Malformation and Syringomyelia in the Cavalier King Charles Spaniel. Peer-reviewed veterinary publications.

  4. American College of Veterinary Internal Medicine. Consensus statements on canine neurology and diagnostic imaging.

  5. WSAVA. Global recommendations for companion animal health care.

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.