Exercise induced collapse (EIC) is a common cause of episodic exercise intolerance and collapse in otherwise healthy, adult, Labrador Retrievers. Dog owners and professional trainers have recognized affected individuals for at least 20 years, but they have not had a name for the disorder. Veterinarians have speculated that the episodes might be due to heat intolerance, low blood sugar, electrolyte (sodium, potassium or chloride) disturbances, heart rhythm abnormalities, or an inherited muscle disorder. Dogs with EIC are normal at rest and able to tolerate mild to moderate exercise but occasionally become incoordinated and collapse after 5 to 15 minutes of strenuous exercise. It is common for related dogs (littermates) to be affected.
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