Myotonia in related Chow Chow dogs

B.R. Jones Department of Veterinary Clinical Sciences, Massey University, Palmerston North, N.Z.

L.J. Anderson Department of Veterinary Clinical Sciences, Massey University, Palmerston North, N.Z.

G.R.G. Barnes Department of Chemistry, Biochemistry & Biophysics, Massey University, Palmerston North, N.Z.

A.C. Johnstone Department of Veterinary Pathology & Public Health, Massey University, Palmerston North, N.Z.

W.D. Juby Hodgson, Juby and Lyons, Ngatea, N.Z.

Summary

A myopathy associated with myotonia was observed in three related Chow Chow dogs. The clinical signs were first noticed at 2 to 3 months of age. They included muscle spasm and stiffness of gait which decreased in severity with exercise. Electromyographic findings and the demonstration of a muscle percussion dimple confirmed the presence of myotonia. Dystrophic changes were observed in muscle biopsies but histochemical techniques did not demonstrate fibre type changes. An inherited aetiology was suspected but not confirmed.

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Myotonia in related Chow Chow dogs

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Myotonia in related Chow Chow dogs

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