Myotonia Congenita


This condition is characterized by prolonged muscle contraction and stiffness that usually resolves with normal exercise. It can also cause the tongue to protrude, difficulties chewing, and noisy breathing.

  • Signs and symptoms

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

    Signs are first recognized 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


    • Learning physical therapy techniques from your veterinarian may be beneficial at home.

  • Genetic Information

    This variant was first described in the Labrador Retriever.

    This variant 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 19 ‐ chr

    Inheritance type:


  • Breeds affected

    This health condition affects the following breeds

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