Does Your Dog Have Cerebellar Hypoplasia?

If your puppy wobbles when they walk, shakes their head when reaching for a toy, or tips over on turns, it’s worth knowing about cerebellar hypoplasia. It’s a congenital condition where the part of the brain that controls balance and coordination didn’t fully develop before birth. The reassuring part: it’s not painful, it doesn’t get worse over time, and many dogs with it live full, happy lives.

What is cerebellar hypoplasia in dogs?

The cerebellum sits at the back of the brain. Its job is to fine-tune movement, keep your dog balanced, and coordinate the signals that make walking, reaching, and turning smooth. When it doesn’t fully develop in the womb, the result is cerebellar hypoplasia (literally: an underdeveloped cerebellum). The signals still get sent, but without the cerebellum running quality control, movements come out shaky and unsteady.

The key thing to understand: this is a structural issue, not a disease that spreads or worsens. Your dog was born with a cerebellum that’s smaller or less developed than typical, and that’s what it is. It won’t deteriorate further, which sets it apart from cerebellar degeneration in dogs, a different condition where the cerebellum breaks down over time.

What are the early signs of cerebellar hypoplasia in dogs?

Signs typically show up as soon as a puppy starts moving around, usually between 3 and 6 weeks of age. If you’ve adopted an older dog who’s always seemed a little uncoordinated with no clear injury history, these signs may have simply gone unnoticed or been written off as clumsiness. Here’s what to look for:

• Shaking when reaching for something: Your dog trembles when they’re trying to do something, like grab a toy or reach their food bowl, but settles when they’re just lying still. This is called an intention tremor.
• A wobbly, lurching walk: Sometimes described as a “drunken” gait. Your dog staggers or stumbles rather than walking in a straight, steady line.
• A wider-than-normal stance: Legs planted further apart than usual to help compensate for the balance issues.
• Head bobbing: A rhythmic nodding or side-to-side movement, especially when your dog is focused on something.
• Falling or tipping over: Particularly when turning, stopping suddenly, or navigating uneven ground.
• Difficulty reaching food or water bowls: The tremors make bending down and holding still at the same time genuinely tricky.

The key thing to remember: these signs show up early and stay stable. They don’t get worse over time. If your dog’s coordination was normal and has started declining, that’s a different situation and worth a prompt vet visit.

Causes, diagnosis, and how it’s different from cerebellar degeneration

Cerebellar hypoplasia happens when something disrupts cerebellar development in utero (before birth) or in very early puppyhood. Known causes include:

• Viral infection during pregnancy: certain viruses, including canine parvovirus and herpesvirus, can interfere with fetal brain development if the mother is infected while pregnant
• Toxin exposure in utero: exposure to certain chemicals or medications during gestation can affect brain development
• Genetic factors: some breeds appear predisposed, though the genetics aren’t fully mapped in dogs the way they are in cats
• Nutritional deficiencies: severe malnutrition in the mother during pregnancy can affect fetal development

To diagnose cerebellar hypoplasia, your vet will start with a neurological exam, watching how your dog moves, responds, and holds their posture. An MRI can confirm an underdeveloped cerebellum and rule out other causes like a brain tumor or inflammation. Bloodwork and other tests may be run to rule out conditions that look similar.

This is also how vets distinguish cerebellar hypoplasia from cerebellar degeneration in dogs. Degeneration is progressive, meaning it worsens over time, and tends to appear in adult or older dogs rather than puppies. If signs are stable and have been present since puppyhood, hypoplasia is far more likely.

Is cerebellar hypoplasia painful for dogs?

Nope, cerebellar hypoplasia itself doesn’t cause pain. Your dog isn’t suffering because of the condition. They don’t know their gait looks different from other dogs, and the wobbliness doesn’t hurt them.

Where pain can occasionally enter the picture is through secondary injuries: a dog who stumbles frequently may bump into things or take a tumble down stairs. Managing your dog’s environment is the biggest way to keep your dog comfortable and safe day to day.

The good news is that cerebellar hypoplasia doesn’t shorten a dog’s life. Most affected dogs live just as long as any other dog of their breed. With good overall health and a home environment set up to keep them safe, there’s no reason they can’t live a full, comfortable life.

Home setup guide for a wobbly dog

Managing cerebellar hypoplasia is largely about creating an environment where your dog can move, eat, play, and rest safely. Here’s what actually makes a difference:

Area	What to do
Flooring	Non-slip rugs or yoga mats on hardwood, tile, or laminate floors, especially on your dog’s usual routes. Rubber-backed runners work well in hallways. Grip socks or booties can help too, though some dogs need time to get used to them.
Food and water	Use raised, anchored bowls to reduce how far your dog has to reach. Place them in a corner so they don’t slide. Slow-feeder bowls can help if excitement-triggered tremors make eating messy.
Stairs and edges	Block stairs with a baby gate since falls are the biggest injury risk. Use ramps instead of steps for sofas or beds. Add corner guards or foam padding to sharp furniture edges at dog height.
Walks and harnesses	A harness with a back handle lets you steady your dog without pulling their neck. Keep walks on flat, even ground and short enough that your dog isn’t exhausted.
Play	Soft, low-to-the-ground toys work better than anything requiring jumping or quick turns. Short play sessions on grass or padded surfaces are ideal. Supervised play with other dogs is fine, but skip rough play with much larger or bouncier dogs.

Does pet insurance cover cerebellar hypoplasia in dogs?

It depends on timing. Cerebellar hypoplasia is eligible for coverage under a Lemonade Pet accident and illness policy, but only if the condition isn’t pre-existing. Because it’s present from birth, many dogs are already showing signs before a policy is in place or during the 14-day illness waiting period, which would make it pre-existing and ineligible. If your dog is newly adopted and hasn’t shown any signs yet, it’s worth getting coverage in place quickly. Either way, a Lemonade Pet policy can still help cover other accidents and illnesses that come up down the road. 

Before we go

Cerebellar hypoplasia doesn’t have a cure, but it also doesn’t have to define your dog’s quality of life. With the right home setup and a good relationship with your vet, most wobbly dogs do remarkably well. The wobble is just part of who they are, and for most of them, it doesn’t slow them down nearly as much as you might expect. Get a quote with Lemonade in minutes.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.