Coursing thirst, the musings of a layman.   When a dog runs itself to a standstill you would expect it to damage the major muscles of locomotion and in extreme cases this can potentially lead to the life threatening complication of Rhabdomyolysis (RMS). In simple terms with RMS the damaged muscles cells breakdown and releases their contents into the blood stream, this impacts on the kidneys with possibly a resultant fluid shift from the blood into the damaged muscle tissue. RMS is an emergency