Loyal’s Drug, LOY-001, Offers Hope for Extending Lifespan of Large Breed Dogs

7 December 2023

San Francisco-based company, Loyal, is seeking conditional approval from the FDA for its drug designed to address the shorter lifespans of large- and giant-breed dogs.

In a groundbreaking development, Loyal, a San Francisco-based company, is on the cusp of obtaining conditional approval from the Food and Drug Administration (FDA) for its drug, LOY-001. This drug aims to tackle the shorter lifespans often faced by large- and giant-breed dogs. With the potential to hit the market by 2026, pending FDA approval, LOY-001 offers hope for extending the lifespan of these beloved pets.

Addressing the Lifespan Discrepancy:

Large- and giant-breed dogs, such as Great Danes and Newfoundlands, often have 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. The discrepancy in lifespan can be attributed to elevated levels of the growth-promoting hormone IGF-1 in larger dogs.

The Role 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 veterinarians can administer every three to six months. Once 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 step forward, Loyal 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 potential approval of LOY-001 by the FDA brings hope to pet owners with large- and giant-breed dogs. If successful, this drug could revolutionize the way these pets are cared for, offering the promise of an extended and healthier life. With Loyal’s dedication to developing drugs that extend healthy lifespans in dogs, the future looks promising for our furry companions. As we eagerly await further updates, the possibility of longer and happier lives for our beloved pets is within reach.

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