GM2 Gangliosidosis in Dogs

Category: Nervous System & Behavioral
Inheritance: Autosomal recessive
Breeds documented: 1
Published sources: 6

Overview

Fatty substances called GM2 gangliosides build up inside nerve cells, gradually interfering with brain function. Several inherited forms are grouped under this name, including Tay-Sachs and Sandhoff disease. Affected dogs can lose coordination, develop vision problems and show changes in behavior or awareness. The condition is progressive, so signs become more disabling over time.

Signs to watch for

Unsteady walking or difficulty keeping balance
Changes in behavior or awareness
Worsening eyesight

The age at onset varies among forms, with signs reported in puppies and young adults.

Emergency Call a vet now if your dog starts staggering.

Diagnosis and tests

Vets can investigate suspected disease with genetic tests and specialized blood tests of enzyme activity. Brain imaging can reveal changes that support further investigation. Some affected Japanese Chins have normal or raised enzyme activity on standard laboratory assays, so those results alone can be misleading.

Breeds with documented risk

1 breed

By breed size

1 Toy

Japanese ChinToy · Toy Group

Inheritance

Autosomal recessive
A dog is affected only if it inherits two copies of the gene variant, one from each parent. A dog with one copy is a carrier: usually healthy, but able to pass the variant on. When two carriers are bred, on average one puppy in four is affected. A DNA test can tell clear, carrier and at-risk dogs apart.
As stated by OMIA

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.