Cerebellar Hypoplasia

What Is Cerebellar Hypoplasia?

Cerebellar hypoplasia (CH) means the cerebellum, the part of the brain that coordinates movement and balance, did not develop to its full size before or shortly after birth. Affected kittens and puppies walk with a wobbly, swaying gait and may have head tremors. CH is not painful, not contagious and not progressive. Pets do not get worse with age, and many learn to compensate remarkably well.

Causes

• Panleukopenia in cats: the most common cause. When a pregnant cat is infected with feline parvovirus, or a kitten is infected in its first weeks, the virus attacks the fast-growing cerebellum. See feline panleukopenia.
• Canine herpesvirus or parvovirus in puppies: infection in the womb or just after birth can damage the developing brain.
• Genetics: some dog breeds, including Chow Chows, Airedale Terriers, Bull Terriers and Irish Setters, have inherited forms.
• Other factors: toxins, poor nutrition or trauma during pregnancy can contribute.

Signs

Signs appear as soon as kittens or puppies start walking, usually around 3 to 6 weeks of age:

• Wide-legged stance and a swaying, high-stepping or “drunken” walk
• Head bobbing or tremors that get worse when the pet focuses on eating or a toy (intention tremors)
• Falling over, misjudging jumps or distances
• Normal alertness, appetite and personality

Severity ranges from a mild wobble to pets that cannot walk without support.

Diagnosis

A vet usually suspects CH from the age of onset, the typical gait and the fact that signs are stable rather than worsening. A neurological exam helps rule out other causes of wobbliness, such as ear infections, vestibular disease, toxins or progressive brain disease. MRI can confirm a small cerebellum but is often not needed when the history is clear.

Treatment and Care

There is no treatment to regrow the cerebellum, and none is needed for comfort. Care focuses on safety and independence:

• Carpet, rugs or yoga mats on slippery floors
• Low-entry litter boxes with high sides to brace against
• Ramps or low steps instead of high perches, and padded edges where pets often fall
• Raised or weighted food and water bowls that do not tip
• Indoor-only living, since affected pets cannot escape danger quickly
• Physical therapy and play to build strength and coordination

Practical Tips for US Pet Owners

• Vaccinate cats against panleukopenia on schedule, ideally before breeding, to prevent CH in future litters. See the cat vaccination schedule.
• Never give a modified-live panleukopenia vaccine to a pregnant cat.
• Many shelters and rescues place “wobbly kittens” with adopters. Browse pet adoption listings to find groups near you.
• Ask your vet to note CH in your pet’s record so future clinics do not mistake it for a new neurological problem.

Key Takeaways

• CH is an underdeveloped cerebellum present from birth or early life.
• Panleukopenia infection is the leading cause in cats.
• It is non-painful, non-contagious and does not get worse.
• Home adjustments let most affected pets live long, happy lives.

FAQ

Can a cat with cerebellar hypoplasia infect other cats?
No. CH itself is not contagious. The virus that caused it is long gone by the time signs appear.

Does cerebellar hypoplasia shorten life?
No. Pets with CH have a normal life expectancy when kept safe from falls and outdoor hazards.

Will my wobbly kitten improve?
The brain does not change, but many kittens get noticeably steadier as they learn to compensate.