Ataxia is a symptom, rather than a disease, which can be defined as general incoordination. At first glance, ataxia can look like muscle weakness. However, the problem lies within the sensory nervous system. Motor nerves and the patient’s strength are not affected.
What Does Ataxia Look Like?
Clients often describe their dog as looking intoxicated. Signs may appear suddenly or gradually over time.
Some of the general symptoms of ataxia include:
In some cases, a head tilt may be present. Abnormal eye movements can also occur with certain types of ataxia.
Any dog showing signs of ataxia should be examined promptly by a veterinarian.
There Are Three Types of Ataxia
1. Vestibular ataxia
The vestibular system is comprised of the brainstem and inner ear. It is responsible for interpreting how the dog’s body is oriented relative to the rest of the world, then coordinating movement in response. Vestibular ataxia classically produces a head tilt although other symptoms are often present as well.
This type of ataxia is further classified by which part of the vestibular system is involved:
2. Cerebellar ataxia
The cerebellum is the part of the brain responsible for coordinating fine motor movement. Dogs may appear normal when they are resting, but tremors occur when they stand up. Walking reveals an abnormal gait with very exaggerated steps.
The primary example is cerebellar hypoplasia, which is when the cerebellum doesn’t form properly during fetal development. This can be the result of exposure to certain viruses or toxins in utero, genetic factors, or sometimes idiopathic (meaning an explanation isn’t found).
3. Proprioceptive ataxia
Proprioception is awareness of where the head, body, and legs are in space. It relies on messages from sensory receptors in skeletal muscle, tendons, and joint capsules being able to travel along the spinal cord. Proprioceptive ataxia is different from vestibular and cerebellar ataxia because symptoms occur from the neck down (the head is not affected). Dogs may drag their toes and not realize when their feet are “knuckled” over.
Proprioceptive ataxia is always due to spinal cord compression or damage, which affects how sensory information can be transmitted. Examples include trauma, inflammation, nerve degeneration, and tumors.
Which Type of Ataxia Is It?
Careful assessment of your dog’s symptoms helps your veterinarian figure out which type of ataxia is affecting them. Identifying where the problem is located narrows down the possible causes of your dog’s ataxia. It also helps determine which diagnostic tests will be most useful, what treatments may be needed, and the likelihood of your dog making a full recovery.
| Possible Causes | Common Symptoms | ||
| Vestibular | Central
(brainstem) |
tumor stroke or brain bleed bacterial, viral, or fungal infection immune-mediated metabolic disorders toxicity thiamine deficiency hypothyroidism |
head tilted to one side leaning, falling, rolling walking in circles abnormal eye movement drowsiness (central) Horner’s Syndrome (peripheral) |
| Peripheral
(inner ear) |
inner ear infection idiopathic (no cause found) hypothyroidism |
||
| Cerebellar |
cerebellar hypoplasia (usually hereditary in dogs) infectious (e.g., canine distemper, Rocky Mountain Spotted Fever) degenerative diseases (e.g., cerebellar abiotrophy) inflammatory (e.g., GME*) primary or secondary tumor traumatic injury toxicity |
exaggerated limb movements tremors (head, body, legs) wide stance in back legs |
|
| Proprioceptive |
damage to the spinal cord: traumatic injury intervertebral disc disease (IVDD) degenerative myelopathy fibrocartilaginous embolism (FCE) tumor |
symptoms only from the neck down (head is not involved) feet crossing over each other dragging toes feet “knuckle” over |
|
How Do Veterinarians Figure Out What’s Causing Ataxia?
1. Take a thorough history:
2. Observe your dog’s movement
It can be helpful if you are able to bring in a video of your dog’s behavior at home, but it is not necessary.
3. Perform a complete examination
4. Diagnostic testing
Depending on their findings, your veterinarian may recommend any of the following:
They may also suggest referring your dog to a veterinary neurologist. It is important to realize that this can mean a significant financial commitment. Neurologists often utilize advanced imaging (CT, MRI), which requires general anesthesia, and some neurologic conditions require long-term treatment with expensive medications.
How Is Ataxia Treated in Dogs?
Treatment of ataxia depends on what is causing the symptoms. Some conditions, such as idiopathic vestibular disease, simply require supportive care while waiting for symptoms to resolve. This may involve keeping your dog confined to a safe and comfortable location, helping them walk, and using medication to manage nausea. Intravenous (IV) fluid therapy is sometimes needed to help maintain hydration and administer medication if it can’t be given by mouth.
Other forms of ataxia may require a hospital stay, surgery, or medication. Treatment may be short-term or long-term, depending on the condition being treated.
Some conditions cannot be cured, for example, cerebellar hypoplasia. Fortunately, this is not a painful condition, and it does not tend to get worse over time.
Will My Dog Recover from Ataxia?
Prognosis depends on the cause of ataxia and varies widely. Some dogs can be expected to make a full recovery. Others, unfortunately, may have long-term symptoms, succumb to their disease, or their quality of life may be affected such that humane euthanasia is the kindest option.
Your veterinarian will be able to offer more specific expectations based on your dog’s condition.
Featured Image Credit: f8grapher, Shutterstock
Quoted from Various Sources
Published for: WATPFC
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