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
(Images and name used with permission
of the owner)