WJ Brad Hanna, DVM, PhD
Ontario Veterinary College
University of Guelph
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Hereditary myotonia in an Australian Cattle Dog
Posted July 6, 2006

Myotonic dog. "Kai", a 4-year-old female spayed Australian Cattle Dog with a life-long history of muscle stiffness and hypertrophy, is homozygous for a mutation of CLCN1. In this video she is seen chasing a soccer ball following a short rest. After a few strides she experiences severe skeletal muscle rigidity that causes her to fall. She recovers within seconds.
(Images and name used with permission of the owner)


Myotonic dog. Another episode of transient muscle rigidity in Kai.


Myotonic dog. Kai after warming up. She is able to run (stiffly) without falling.


This research is part of an on-going collaboration between Drs Brad Hanna (Biomedical Sciences) and Andrew Bendall (Molecular & Cellular Biology) at the University of Guelph. For further information please contact Dr. Brad Hanna.

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Last updated January 4, 2013