Myotonia Congenita (Australian Cattle Dog)

Body function:
Muscle & Neurological
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Myotonia congenita is a hereditary muscle disorder primarily observed in breeds such as the Australian Cattle Dog. This condition is caused by a mutation in the CLCN1 gene, leading to delayed muscle relaxation after contraction.
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List of affected breeds:

Genetic research has linked this gene and condition in the following breeds:

Australian Cattle Dog, Border Collie

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What does this mean for a dog with this trait?

Care for dogs with myotonia congenita focuses on managing their symptoms and ensuring their comfort. While there is no cure for the disorder, regular exercise can help alleviate some of the muscle stiffness and improve coordination. It is also important to monitor the dog’s condition closely, especially during periods of heat or excitement, to minimize episodes of muscle stiffness.

Symptoms

Symptoms usually become apparent when puppies begin to walk, manifesting as a stiff, uncoordinated gait often described as a "bunny hop." Affected dogs may frequently fall and exhibit muscle stiffness that can improve with increased exercise. Additional signs include enlarged muscles, especially in the neck and limbs, and an abnormal posture, with episodes potentially worsening in hot weather or during excitement. Despite these symptoms, the disorder is non-painful and typically does not affect the dog's lifespan.

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