Myotonia Congenita in Dogs

Category: Muscle
Breeds documented: 2
Published sources: 4

Overview

Muscles stay tightened longer than they should after a movement, making it difficult for an affected dog to move freely. Faulty channels in muscle cells interfere with the normal electrical signals that let muscles relax. Stiffness often becomes more noticeable after rest or in cold weather. The disorder does not usually worsen over time, although stiffness can remain throughout life.

Signs to watch for

Stiff movements, especially when getting up after resting
Hopping with the back legs rather than taking normal steps
Muscles that look unusually large
Freezing and falling over when startled

Signs usually appear when puppies first start walking.

When to get help Arrange a vet visit when you notice persistent stiffness or an unusual hopping gait.

Diagnosis and tests

A vet considers the dog's age, breed and pattern of stiffness, then examines the muscles and movement. Electromyography records electrical activity in the muscles and helps confirm the problem. DNA tests are available for known variants in Miniature Schnauzers and Australian Cattle Dogs.

Breeds with documented risk

2 breeds

By breed size

1 Small
1 Medium

Miniature SchnauzerSmall · Terrier Group
Border CollieMedium · Herding Group

Inheritance

Not yet known
None of the sources we use states how this is inherited in dogs yet.

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.