Myotonia Congenita

Muscular

This condition is characterized by prolonged muscle contraction and stiffness that usually resolves with normal exercise.

  • Signs and symptoms

    Affected dogs present as puppies for prolonged muscle contractions, especially after resting. This leads to visibly appreciable muscle rigidity and a stiff, hopping gait. The tongue muscle is often affected as well, causing affected dogs to have a characteristic protruding tongue. Affected dogs may also have difficulty swallowing or may regurgitate their food after eating due to involuntary muscle contractions.

    Signs first appear in puppies.

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  • Diagnosis

    Genetic testing, clinical signs, EMG, and muscle biopsy can be used to diagnose this disease.

  • Treatment

    There is no treatment currently for this condition, but physical therapy can be beneficial.

  • What to do if your dog is at risk

    Actions

    • Talk to your vet about your dog’s myotonia congenita result so you can plan appropriate care and monitoring.
    • Signs such as muscle stiffness after rest often improve with gentle movement or warm-up activity.
    • Avoid sudden or strenuous exercise, and provide good traction at home to help your dog move safely.
    • Learning gentle stretching or physical therapy techniques from your vet may also help keep your dog comfortable and flexible.

  • Genetic Information

    This mutation was first described in the Miniature Schnauzer.

    This disease is inherited in an autosomal recessive manner, meaning that affected dogs must have two copies of the mutation to show clinical signs.

    Gene names:

    CLCN1 (Exon 7) ‐ chr

    Inheritance type:

    recessive

  • Breeds affected

    This health condition affects the following breeds

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