Dermoid Sinus in Dogs

Category: Skin & Connective Tissue
Inheritance: Multifactorial
Breeds documented: 2
Published sources: 4

Overview

A small skin opening can lead into a deeper tube of tissue in a dog born with a dermoid sinus. Hair and skin debris can collect inside, and the tract may become inflamed or infected. Some tracts remain near the skin, while others reach the coverings of the spinal cord. Deep infection can cause pain and problems with movement.

Signs to watch for

A small skin opening, sometimes with a tuft of hair
A swelling under the skin
Fluid draining from an opening
Back pain or difficulty walking if deeper tissues are affected

The defect is present from birth, but signs may not appear until later.

When to get help Book a vet visit promptly for a skin opening, swelling or drainage along the back.

Diagnosis and tests

Vets examine the skin opening or swelling and assess any pain or changes in walking. MRI or CT scans can help show how far the tract extends and whether nearby spinal structures are involved. Imaging does not always reveal the entire tract, so the findings need careful interpretation.

Breeds with documented risk

2 breeds

By breed size

1 Medium
1 Large

Rhodesian RidgebackLarge · Hound Group
Thai RidgebackMedium · Foundation Stock Service

Inheritance

Multifactorial
Rhodesian Ridgeback
Several genes and the environment together set the risk. Diet, growth rate, weight and exercise can all play a part. There is no single DNA test. Screening the parents (for example hip or elbow scores) and choosing from lines with good results lowers the risk, but does not remove it.
As stated by PubMed: Distl 2022 (abstract fetched through Europe PMC)

We've gathered what published sources say about this condition, so you can talk it through with your vet. It isn't veterinary advice: you and your vet know your dog best.