Canine wobbler syndrome – how does this disease manifest itself in my dog?

Wobbler syndrome describes a complex of symptoms caused by nerve damage in the cervical spine. The often typical ataxic (irregular) gait of affected animals gave the disease its name, as the English word "to wobble" means to sway or stagger. It occurs particularly often in Dobermans and Great Danes, but other large breeds of dog can also be affected. Male dogs are twice as likely to develop the condition as females.

INHALT
Causes, development, and classification Symptoms Diagnosis Treatment Forecast Prevention
Causes, development, and classification

Damage to the spinal cord can be caused by a variety of different changes to the spine. In terms of the symptoms that occur, a distinction is made between static and dynamic narrowing of the spinal canal. In the case of dynamic narrowing, compression of the spinal cord only occurs as a result of neck movement, whereas in the case of static wobbler syndrome, it is permanently compressed.

The most common causes include chronic degenerative disc changes, especially in Great Danes and Dobermans. Overuse can cause structural changes and swelling of the intervertebral discs in older dogs, causing them to bulge into the spinal canal from below and press on the spinal cord.

In young dogs in particular, malformed vertebrae in the area between the third and seventh cervical vertebrae can lead to compression of the spinal cord. It is still unclear whether these malformations are hereditary or nutritional. A subluxation (incomplete dislocation) of the joint between the first and second cervical vertebrae can lead to joint instability and thus also to spinal cord damage. Malformations of the vertebral arch or the joint processes (primarily in Great Danes) in combination with a thickening of the vertebral ligament can pinch the spinal cord from above or from the side. Tumors, cartilage changes, abscesses, or other inflammatory changes can also trigger wobbler syndrome. Predisposing factors for the disease include rapid growth, malnutrition, and calcium excess.

Diagram of the cervical spine in dogs
1 Skull | 2 First cervical vertebra | 3 Seventh cervical vertebra | 4 First thoracic vertebra | 5 Spinous process | 6 Vertebral arch | 7 Vertebral body | 8 First rib | 9 Cervical spine
Symptoms

Dogs with wobbler syndrome usually exhibit a characteristic gait, with symptoms developing very slowly and often being overlooked at the onset of the disease. Initially, only a slightly unsteady, swaying gait and difficulty standing up can usually be observed. As the disease progresses, which can take weeks or months, the typical exaggerated movements of the hind limbs occur, while the dog takes small, shuffling steps with the front limbs. The dog basically runs with two different gait patterns, which is also known as "two engine gait." In severe cases, complete paralysis of the limbs may occur.

Diagnosis

If you notice any suspicious symptoms, you should take your dog to the vet immediately. Describe the changes you have noticed in your dog as accurately as possible.

After taking this detailed preliminary report, they will subject the dog to a thorough general and neurological examination, which includes various tests to check the function of the central nervous system. This provides them with important initial information about the location of any spinal cord damage.

However, an X-ray examination is essential for an accurate diagnosis, although normal X-rays do not usually reveal all narrowings. Only with the help of myelography, which involves taking X-rays with a contrast agent injected into the spinal canal, can narrowings of the spinal canal be reliably detected. CT or MRI scans can help to further narrow down the affected area or to clarify cases that are still unclear after myelography.

Treatment

Depending on the type and severity of the damage and the age of the dog, different treatment plans must be developed for Wobbler syndrome. In cases with mild symptoms, non-bony changes, and no progression, conservative therapy may be sufficient. The dog is kept completely calm and given painkillers. In young dogs, the composition of their food should also be checked.

If herniated discs and bony vertebral changes are the cause of spinal cord compression, only surgery can relieve the pressure on the nerve tissue. Depending on the type and extent of the change, different surgical techniques are available. Your veterinarian will advise you in detail on the planned procedure in each individual case.

Forecast

For young dogs with mild and non-progressive symptoms, the prognosis is cautious if the treatment plan is strictly adhered to. After surgery, the chances of recovery depend on the severity and duration of the symptoms. The longer the symptoms have been present (even before surgery) and the more severe they are, the poorer the prognosis. Older and more severely affected dogs also generally have a poorer prognosis.

Prevention

Since some of the causes are genetic, the disease cannot be completely prevented. However, as a dog owner, you can take a few targeted measures to minimize certain factors that contribute to the disease. By feeding your dog a balanced diet that is not too high in energy and ensuring it gets regular exercise without excessive strain during its growth phase, you can significantly reduce the risk of the disease.