Breakthrough Drug Offers Hope for Extending Lifespan of Large-Breed Dogs

3 December 2023

San Francisco-based company Loyal receives conditional approval from the FDA for its drug LOY-001, aimed at addressing the shorter lifespans of large- and giant-breed dogs.

In a significant development for the world of veterinary medicine, San Francisco-based company Loyal has received conditional approval from the Food and Drug Administration (FDA) for its groundbreaking drug, LOY-001. This drug, designed to combat the shorter lifespans of large- and giant-breed dogs, has the potential to revolutionize the way pet owners care for their beloved furry companions. With the FDA’s conditional approval, Loyal is one step closer to extending the healthy lifespan of these dogs and providing them with a better quality of life.

Reducing the Lifespan Discrepancy:

Large- and giant-breed dogs, such as Great Danes and Newfoundlands, often face significantly shorter lifespans compared to smaller breeds like Chihuahuas and Miniature Poodles. While smaller breeds can live up to 20 years, larger breeds typically live only seven to eight years. This discrepancy is primarily attributed to the elevated levels of the growth-promoting hormone IGF-1 found in larger dogs.

The Promise of LOY-001:

Loyal’s drug, LOY-001, aims to address this issue by reducing the levels of IGF-1 in adult dogs. By targeting this hormone, LOY-001 has the potential to extend the healthy lifespan of large- and giant-breed dogs. The drug is designed as a long-acting product that will be administered by veterinarians every three to six months. Once officially approved by the FDA, dogs over the age of 7 and weighing more than 40 pounds may be eligible for LOY-001 shots.

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The Path to FDA Approval:

While conditional approval from the FDA is a significant milestone for Loyal, the company must still conduct a series of complex studies to gather definitive efficacy data and meet the FDA’s stringent manufacturing and safety criteria. The conditional approval is valid for up to five years, during which Loyal will work diligently to complete the necessary data collection and apply for full approval.


The conditional approval of Loyal’s drug, LOY-001, offers hope for extending the lifespan of large- and giant-breed dogs. With the potential to address the shorter lifespans of these beloved pets, LOY-001 could revolutionize the way pet owners care for their larger canine companions. As Loyal continues its journey towards full FDA approval, the possibility of an extended and healthier life for large-breed dogs becomes increasingly tangible. This breakthrough in veterinary medicine is a testament to the dedication and innovation of the team at Loyal, who are working tirelessly to improve the lives of our furry friends.

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