For centuries, coal miners would descend into the depths of the earth accompanied by a canary in a cage. Being more sensitive to toxic gases, the canary would show signs of distress long before the miners, acting as a sentinel and alerting them to danger.
Today, scientists propose a similar role for dogs, suggesting that these loyal companions could help flag health issues for humans. A recent editorial in the journal Science suggests that the health of our dogs could be an early indicator of various health problems affecting humans.
The Sentinel Role of Dogs
“Dogs are special animals because they have coexisted with humans for about 30,000 years. By sharing space, the factors that can influence their health are very similar to ours,” explains Courtney L. Sexton, a professor at the University of Virginia and co-author of the paper with Audrey Ruple.
Due to their behaviors and shorter lifespans, dogs can be early warning systems for infectious diseases, exposure to heavy metals, and other environmental hazards that could eventually affect humans.
Case Study: The Kidney Failure Outbreak in 2007
There are already examples of dogs acting as sentinels. In 2007, an increase in kidney failure among pets in the United States led to the discovery of contaminated dog food. This contamination also affected chickens and pigs destined for human consumption, leading to a swift recall and preventing a potential public health crisis.
The researchers suggest establishing a more formal sentinel program within veterinary clinics to routinely collect and analyze data, helping to protect both canine and human health.
Enhanced Veterinary Medicine and Human-Animal Interaction
“Our relationship with pets has evolved significantly,” says Guadalupe Miró, Professor of Parasitology and Parasitic Diseases at the Complutense University of Madrid. Advances in veterinary medicine and closer human-animal interactions make monitoring and detecting health issues easier.
However, Miró emphasizes the need for proper hygiene and caution, as closer contact increases the risk of zoonotic diseases that can be transmitted from animals to humans.
The One Health Approach
The Science report emphasizes the One Health concept, which recognizes the interconnectedness of human, animal, and environmental health.
Sexton explains, “It’s a transdisciplinary approach to public health based on the principle that the health of people, the environment, and the animals with whom we share the environment are interconnected.” This approach has gained renewed recognition over the last 20 to 30 years.
The Fuenlabrada Outbreak: A One-Health Example
Miró highlights the 2010 leishmaniasis outbreak in Fuenlabrada, Madrid, as a case study for the One Health approach. Initially thought to be transmitted from dogs to humans, further investigation revealed that hares in a newly created park were the actual reservoirs of the disease.
The vectors, sandflies, fed on the hares and then infected humans, illustrating the close relationship between human health, animal health, and environmental changes.
Dogs vs Cats as Sentinels
In an editorial response in Science, Ramiro Pastorinho from the University of Évora, Portugal, highlights the potential of companion animals as public health sentinels.
However, he notes, “The belief that, among companion animals, dogs are the best positioned to perform the task of sentinels of toxic exposure is debatable. For instance, due to their grooming habits, cats are much better sentinels of exposure for toddlers.”
The Need for a Centralized Veterinary Network
While dogs and cats can serve as health sentinels, the veterinary network lacks a centralized system to pool data and detect trends.
Establishing such a system could enhance our understanding of pet health and, by extension, human health. Collecting data more efficiently can improve the health outcomes for pets and their owners, as emphasized in the Science report.
As our relationship with pets continues to evolve, recognizing and leveraging their potential role as sentinels of human health can offer significant public health benefits.
Implementing a systematic approach within veterinary practices to monitor and analyze pet health could serve as an early warning system for various human health issues, ensuring timely intervention and prevention measures.
By improving how we collect and analyze data on pet health, we can better protect our furry companions and ourselves, creating a healthier future for all.
The information is taken from El Pais and NBC News
