What is atlantoaxial instability?

Atlantoaxial instability is a condition in which the first and second cervical vertebrae (the atlas and axis) are unstable, which can cause neck pain, altered gait, and abnormal reflexes. Diagnosis requires a neurological examination and imaging by a vet — speak to your vet for a proper assessment.

What should I do if my pet has a stiff neck or won't turn its head?

Record the symptoms on video and note when they started, avoid forceful handling or pulling on the neck, contact your vet promptly to arrange an examination, and transport your pet carefully to the clinic if needed.

Does atlantoaxial instability require surgery?

Whether surgery is needed depends on the severity and imaging findings. Mild cases may be managed conservatively, while severe cases or those with spinal cord compression may require a discussion about surgical options — your vet will assess this.

How long does recovery take after surgery or conservative treatment?

Recovery time varies considerably between individuals. Some pets show improvement within a few weeks; full recovery may take weeks to months. Follow your vet's recommended schedule for check-ups and follow-up imaging.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Atlantoaxial Instability in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

Atlantoaxial instability is common in small-breed dogs and can cause neck pain ranging to full-limb paralysis; severe cases may require surgical stabilisation.

Take 1 minute to check the symptoms first

Last updated: 2025/12/16

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Sudden neck weakness, unable to hold up the head
•Slowed breathing or obvious difficulty breathing
•Sudden collapse or brief loss of consciousness

Arrange a clinic visit as soon as possible (within 24-72 hours)

•Reduced mobility but still able to move short distances
•Neck pain, avoiding being touched, or unwilling to turn the head
•A marked change in appetite or alertness but still eating

01What signs and symptoms should you watch for?

Atlantoaxial instability typically presents with neurological and neck pain-related signs that can range from mild to severe.

Reduced mobility — appears weak or reluctant to move
Depression or dulled responsiveness; occasional brief collapse
Flinching or pain response when the neck is touched
Difficulty lifting or turning the head; reduced neck range of motion
Visible swelling or mild oedema around the neck area
In rare cases, broken skin on the neck with minor bleeding

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden weakness in the neck and inability to support the head
⚠️ Slowed breathing or obvious respiratory distress
⚠️ Sudden collapse or brief loss of consciousness

02How can you assess the situation at home? Key observations and when to go to emergency

Observing and recording changes at home helps your vet quickly assess the condition and determine how urgently your pet needs to be seen.

Note the date and exact time symptoms first appeared
Use your phone to record front- and side-view videos of your pet walking and lifting its head
Track appetite and water intake daily and note any changes
Observe and record the frequency and character of urination and defecation
Weigh your pet every few days and note any posture or body-condition changes
If symptoms worsen or persist, schedule a specialist consultation as soon as possible

03How will the vet diagnose this? Common tests and procedures

Assessment at the clinic focuses on detailed neurological evaluation and imaging to locate the instability and identify spinal cord compression.

Physical and neurological examination to assess cervical range of motion and reflexes

X-rays for initial evaluation of skeletal alignment and obvious abnormalities

CT (computed tomography) scan to evaluate bone detail and degree of luxation

MRI (magnetic resonance imaging) to assess spinal cord and soft-tissue compression

Blood and biochemistry panels to assess overall health and anaesthetic risk

Discussion of further diagnostics or surgical planning under anaesthesia if indicated

04How is this treated and managed after diagnosis? Medications, diet, and home care

Treatment includes both conservative and surgical options; ongoing monitoring of neurological function and repeat imaging is required regardless of the approach.

Short-term anti-inflammatory and pain relief medications to manage symptoms
Moderate-to-severe cases require assessment of whether surgical cervical stabilisation is needed
Restrict activity at home and use neck support to prevent worsening
Weight management and dietary adjustment to reduce load on the neck
Schedule regular follow-up visits as directed to monitor neurological recovery
Arrange follow-up imaging (X-ray, CT, or MRI) as needed to confirm stability

05What should you prepare before the vet visit? Key information to help your vet

Record the onset time, progression, and any possible triggering events

List recent changes in appetite, water intake, and elimination patterns

Prepare a list of current and past medications or supplements

Bring phone videos and photos showing how your pet walks and holds its head

Bring any previous imaging or test reports if available for comparison

Use a secure carrier and book an appointment with a neurology or surgery specialist in advance

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

Related Symptoms (You May Also Be Looking For)

Fatal outcome

Tissue swelling

Severe bleeding

Partial paralysis

Four limb weakness

Four limb paralysis