Atlantoaxial Instability in Dogs: Welfare Guide

Key Facts

• Most common in Chihuahuas, Yorkshire Terriers, and Pomeranians due to congenital dens abnormalities
• Signs range from neck pain and reluctance to move to tetraparesis or respiratory paralysis
• Minor trauma such as jumping can cause acute deterioration in unstable patients
• Surgical stabilization (ventral screw and PMMA fixation) provides the best long-term welfare outcomes
• Conservative management with neck bracing has poor long-term outcomes compared to surgery

Welfare Considerations

AAI causes significant welfare suffering through neck pain and fear of movement. Affected dogs often adopt a low-head posture, resist neck manipulation, and vocalize from pain. Surgical stabilization is transformative when successful — dogs return to normal pain-free movement. Welfare monitoring after surgery must watch for implant failure and neurological progression.

What You Can Do

• Seek specialist neurological assessment promptly for any toy breed with neck pain and neurological signs
• Restrict all activity immediately — even minor trauma can cause acute deterioration
• Pursue surgical stabilization for suitable candidates — it offers the best long-term welfare outcome
• Use neck bracing only as a bridge to surgery, not as a long-term welfare solution
• Prevent jumping in all toy breeds susceptible to AAI