Short Wave: Helping Dogs and Their Pawrents Live Healthier, Longer

Hosted by Regina Barber | Released on June 9, 2025

Introduction

In the June 9, 2025 episode of NPR's Short Wave, hosts Emily Kwong and Regina Barber delve into the intriguing realm of canine health and longevity. Titled "Helping Dogs and Their Pawrents Live Healthier, Longer," the episode spotlights the groundbreaking Dog Aging Project led by veterinarian and data analyst Audrey Ruppel from Virginia Tech. This initiative seeks to bridge the significant knowledge gap surrounding the health, disease trends, and lifespans of dogs in the United States.

The Knowledge Gap in Canine Populations

Regina Barber opens the discussion by highlighting a surprising fact: while human, livestock, and wildlife populations are meticulously counted and studied in the U.S., pet populations, particularly dogs, remain largely undocumented.

Regina Barber (00:12): "But for pets, not so much."

Audrey Ruppel underscores the implications of this gap:

Audrey Ruppel (00:34): "We have no idea how many dogs live in the United States."

Ruppel explains that the absence of comprehensive data hampers understanding of health and disease trends in dogs, making it challenging to determine factors that contribute to their longevity. This realization spurred the inception of the Dog Aging Project.

Audrey Ruppel (00:54): "The goal of the Dog Aging project is to help us understand what really makes a healthy lifespan for our dogs."

Launching the Dog Aging Project

Initially perceived as a daunting endeavor, especially with its launch coinciding with the onset of the global pandemic in late 2019, the project swiftly surpassed expectations. What began with a target of 10,000 dogs rapidly expanded as dog owners found themselves more available to participate during lockdowns.

Audrey Ruppel (01:37): "We got to 30,000 dogs in just a few months and we're now at over 50,000 dogs enrolled in the project."

The project's expansive dataset aims to elucidate the factors that contribute to a healthy and long life in dogs and, by extension, offer insights into human health due to the shared environments and similar genetics between dogs and their owners.

Audrey Ruppel (02:12): "Dogs are actually a perfect species for us to study in order to really understand what happens for humans in terms of the environmental exposures and also how our genes predispose us to health and disease."

Key Findings from the Dog Aging Project

Over five years, the Dog Aging Project has unearthed several significant insights:

1. Breed Distribution and Diets

   • The dog population within the project mirrors the national distribution: approximately 50% purebred and 50% mixed breeds.
   • Dietary habits reveal that about 85% of participating dogs are fed commercial kibble, while the remaining 15% enjoy a variety of diets, including home-prepared, fresh frozen, and freeze-dried options.

   Audrey Ruppel (04:22): "About 85% of the dogs in our study are being fed a commercially prepared kibble diet."

2. Accuracy of Breed Identification

   • Dog owners exhibit remarkable accuracy in identifying their dogs' breeds, even among mixed breeds. This accuracy was confirmed through genomic testing of approximately a thousand dogs, where owner-reported breeds closely matched genetic results.

   Audrey Ruppel (05:14): "Dog owners were really, really close. Even with mixed breed dogs that had been adopted from shelter type situations, they were pretty close with like what? The mix was pretty close."

3. Lifespan Anomalies in Dogs

   • Contrary to trends observed in other mammals, larger dog breeds tend to have shorter lifespans than their smaller counterparts—a phenomenon yet to be fully understood.

   Regina Barber (06:14): "So, but, so one question I've also thought about, like, again, not a dog owner, but I used to use the dog analogy for talking about stars."

   Audrey Ruppel (06:40): "We still do not know why that happens, but we do know that that is an anomaly when you think about mammals."

Ruppel suggests potential links to growth hormones and genetics but emphasizes that the exact causes remain unidentified.

Addressing Information Gaps

The project's vast and diverse dataset is poised to answer previously unanswerable questions about dog health. Ruppel points out that existing data sources are often flawed, especially concerning less common breeds, making it difficult to assess breed-specific health risks accurately.

Audrey Ruppel (07:27): "We don't know what we don't know."

By conducting large-scale population-based studies, the Dog Aging Project aims to uncover genetic and environmental factors influencing canine health, thereby providing a more nuanced understanding of breed predispositions and disease mechanisms.

Innovative Approaches: Repurposing Human Drugs for Dogs

A notable aspect of the project is its exploration of repurposing human medications to enhance canine health. Specifically, the team is investigating the effects of rapamycin—a drug typically used for immune suppression—at much lower doses to potentially slow cellular aging.

Audrey Ruppel (08:58): "We're actually trying to see if it can actually slow aging at a cellular level."

By inhibiting the MTOR pathway, which is associated with aging, rapamycin could extend the health span of dogs, allowing for better cardiac function and improved physical capabilities without necessarily extending lifespan directly.

Audrey Ruppel (09:10): "So it's not that we're trying to create a longer lifespan, it's that we're trying to create better health while dogs are still alive."

The team is carefully monitoring potential side effects, ensuring that immune function remains uncompromised despite the drug's immune-suppressing origins.

Audrey Ruppel (10:27): "We're using it at a much lower dose, and we are certainly monitoring for other health outcomes along the way."

Implications for Human Health

Ruppel envisions the Dog Aging Project as a sentinel initiative, where dogs serve as early indicators of environmental health threats that could also impact humans. Drawing parallels to historical examples like canaries in coal mines and fish affected by BPA, the project leverages the shorter lifespans of dogs to detect and understand health risks more rapidly.

Audrey Ruppel (10:50): "Dogs are essentially serving as a sentinel for health threats for human populations."

By analyzing comprehensive life exposure data and corresponding health outcomes in dogs, researchers can identify potential environmental hazards and lifestyle factors that may also be relevant to human health.

Future Directions and Goals

Looking ahead, Ruppel aims to refine the "recipe" for a long, healthy life for dogs, which could simultaneously inform strategies to enhance human health and longevity. A major focus is on identifying and mitigating silent environmental threats—chemicals and other factors within households that may negatively impact health.

Audrey Ruppel (12:50): "I do think that learning those keys in the dog population will help us in terms of figuring out what's the right combination of things for the human population as well."

Ruppel expresses an openness to expanding similar studies to other pets, humorously addressing the idea of a Cat Aging Project.

Audrey Ruppel (13:47): "I have no plans to launch a cat aging project, but would be more than happy to help anyone who's interested in launching such an endeavor."

Conclusion

The Dog Aging Project represents a pioneering effort to comprehensively understand canine health and longevity through large-scale data collection and innovative research methods. By bridging the knowledge gap in dog populations, the project not only aims to enhance the lives of dogs and their owners but also aspires to yield insights that could benefit human health. As the project continues to grow, its findings promise to illuminate the intricate connections between genetics, environment, and well-being across species.

For more information or to enroll your dog in the study, visit dogagingproject.org.

Notable Quotes with Timestamps

• Regina Barber (00:34): “We have no idea how many dogs live in the United States.”
• Audrey Ruppel (00:54): “The goal of the Dog Aging project is to help us understand what really makes a healthy lifespan for our dogs.”
• Audrey Ruppel (04:22): “About 85% of the dogs in our study are being fed a commercially prepared kibble diet.”
• Audrey Ruppel (05:14): “Dog owners were really, really close. Even with mixed breed dogs that had been adopted from shelter type situations, they were pretty close with like what? The mix was pretty close.”
• Audrey Ruppel (06:40): “We still do not know why that happens, but we do know that that is an anomaly when you think about mammals.”
• Audrey Ruppel (08:58): “We're actually trying to see if it can actually slow aging at a cellular level.”
• Audrey Ruppel (10:50): “Dogs are essentially serving as a sentinel for health threats for human populations.”
• Audrey Ruppel (12:50): “I do think that learning those keys in the dog population will help us in terms of figuring out what's the right combination of things for the human population as well.”

Learn More

To explore the Dog Aging Project further or to participate, visit dogagingproject.org. Stay updated with the latest episodes of Short Wave by following NPR on your preferred podcast platform.