Hypoplasia of dens

Affects: Dogs

Overview

Hypoplasia of dens is a congenital non-formation of the pivot point of the second cervical vertebra, which leads to spinal cord damage. Onset of the condition may occur at any age, producing signs ranging from neck pain to quadriplegia. Hypoplasia of dens affects dogs. It is more commonly seen in certain breeds, including the Chihuahua, the Papillon, the Pointer and the Yorkshire Terrier.

Educational information only. This page is general guidance and is not a substitute for professional veterinary advice. Never give medicines or change treatment without consulting a veterinarian. If your pet is unwell, contact OC Pets or seek emergency care.
Sources (reused under open licences, with thanks): Wikipedia — “Hypoplasia of dens” (CC BY-SA 4.0) · Compiled by OC Pets Veterinary Clinic, updated 15-06-2026.