Introduction
Labrador Retrievers are known for their athleticism, intelligence, and loyalty—making them ideal sporting dogs and beloved family companions. But in the early 1990s, a mysterious condition began affecting these high-drive dogs, causing them to collapse after intense exercise.
Thanks to groundbreaking research supported by the AKC Canine Health Foundation (CHF), scientists identified the genetic cause of this condition—Exercise-Induced Collapse (EIC)—and developed a test to help breeders and veterinarians manage it (CHF Grant 00352: Genetic Basis of Exercise-Induced Collapse in Labrador Retrievers). This discovery has transformed how we care for affected dogs and protect future generations.
Key Points
- EIC is a genetic neuromuscular disorder caused by a mutation in the DNM1 gene.
- Affected dogs collapse after 5–20 minutes of strenuous activity but recover within 5–30 minutes.
- EIC is inherited in an autosomal recessive pattern—dogs need two copies of the mutated gene to show symptoms.
- A genetic test is now available to identify carriers and affected dogs.
- Responsible breeding can prevent EIC without sacrificing desirable traits.
Challenge Background
In the 1990s, American-bred field trial Labrador Retrievers began experiencing sudden episodes of collapse during or after intense exercise. These episodes were alarming but not painful, and dogs typically recovered quickly. The cause was unknown, and the condition threatened the health and performance of these elite athletes.
Veterinarians, breeders, and researchers needed answers. The retriever community was especially concerned because the condition affected dogs with strong pedigrees and desirable traits. Without a clear understanding of the disease, breeders risked passing it on unknowingly.
The Breakthrough
Dr. Frances Smith, DVM, PhD, DACT—an accomplished breeder and veterinary specialist—played a key role in the search for answers. Her kennel, Danikk Labradors, provided samples for CHF-funded research at the University of Minnesota.
Researchers discovered that EIC is caused by a mutation in the DNM1 gene, which affects the transmission of nerve signals. They confirmed that the disease is inherited in an autosomal recessive manner. This means dogs must inherit two copies of the mutated gene to be affected.
The development of a genetic test for EIC was a major milestone. It allows breeders to identify carriers and avoid producing affected puppies, while still preserving valuable traits in carrier dogs.
Impact & Next Steps
This breakthrough has empowered breeders, veterinarians, and dog owners to manage EIC effectively. Dogs with the condition can live full lives with modified exercise routines and awareness of triggers.
The genetic test helps guide responsible breeding decisions, reducing the risk of EIC in future generations. Dr. Smith continues to advocate for canine health research and supports CHF through donations, education, and outreach.
As CHF celebrates over 25 years of advancing canine health, ongoing collaboration with breeders and scientists will lead to even more discoveries that improve the lives of dogs everywhere. Learn how you can support CHF-funded research at akcchf.org/donate.
