Groundbreaking Drug Developed by Loyal Extends Lifespan of Large Dogs

27 December 2023

Loyal’s LOY-001 receives conditional approval from the FDA, offering hope for increased longevity in large- and giant-breed dogs.

In a groundbreaking development, biotech company Loyal has received conditional approval from the U.S. Food and Drug Administration for their new drug, LOY-001. This veterinary-administered treatment aims to extend the lifespan of large- and giant-breed dogs, marking a significant milestone in animal drug development. With the potential to reduce age-associated diseases and increase longevity, LOY-001 offers hope for dog owners and veterinarians alike.

Addressing the Genetic Factors Behind Reduced Lifespan

Researchers at Loyal have discovered that genetic selection in large dogs prioritizes rapid early growth over strengthening the immune system and improving stress resistance. This focus on growth may leave these dogs more susceptible to age-associated diseases and a higher risk of cancer. Selective breeding of large dogs has led to elevated levels of insulin-like growth factor 1 (IGF-1), a biomarker linked to cell growth. Large dogs can have up to 28 times the IGF-1 levels compared to small dogs. LOY-001 works by reducing IGF-1 levels, potentially addressing the genetic factors that contribute to reduced lifespan in large dogs.

A Historic Breakthrough in Animal Drug Development

Dr. Linda Rhodes, an expert in animal drug development, expressed her excitement about the approval of LOY-001, stating that no drug has ever been approved with a claim to extend lifespan and reduce age-associated diseases in animals. The conditional approval of LOY-001 represents a historic moment in veterinary medicine, paving the way for further advancements in treating challenging indications. Loyal CEO Celine Halioua acknowledges the dedicated work of the team that led to this milestone, highlighting the years of careful research and development behind the drug.

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The Impact of Selective Breeding on Dog Phenotypes

Brennen McKenzie, Loyal’s director of veterinary medicine, emphasizes that the extreme phenotypic variety found in dogs is a result of intensive breeding by humans. Over the years, humans have selectively bred dogs for specific tasks such as herding, protection, and companionship. While this has resulted in a wide range of breeds, it has also led to certain genetic mutations that may contribute to health issues and reduced lifespan. LOY-001 aims to address these genetic factors and improve the overall health and longevity of large dogs.

A Promising Treatment for Longevity

LOY-001 is designed as a long-acting drug that will be administered to dogs every three to six months. With the conditional approval from the FDA, Loyal is working towards final approval, with the drug expected to be available by 2026. If successful, LOY-001 could revolutionize the way large- and giant-breed dogs are treated, offering a promising solution to extend their lifespan and improve their overall quality of life.


The conditional approval of LOY-001 by the FDA represents a significant breakthrough in the field of veterinary medicine. Loyal’s pioneering efforts to develop a drug that can extend the lifespan of large- and giant-breed dogs offer hope for dog owners and veterinarians. By addressing the genetic factors that contribute to reduced lifespan and age-associated diseases, LOY-001 has the potential to revolutionize the way we care for our furry companions. As we eagerly await the final approval and availability of LOY-001, we anticipate a brighter future for large dogs, where they can live longer, healthier lives.

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