The Hidden Risks of Dog Daycare: Lessons from a Major Leptospirosis Outbreak
For years, pet owners viewed dog daycares as safe, social environments for their companions. However, a significant 2021 outbreak of leptospirosis in Los Angeles County—which sickened more than 200 dogs—has forced a reevaluation of how these facilities manage health and disease transmission.
Research led by the University of California, Davis, published in the Journal of Clinical Microbiology, suggests that while leptospirosis is typically spread through contaminated environments, crowded daycare settings may be facilitating direct dog-to-dog transmission, an atypical behavior for this disease.
When Boarding Becomes a Risk Factor
Jane Sykes, a professor of small animal internal medicine at the UC Davis Weill School of Veterinary Medicine, notes that the boarding environment itself emerged as a critical risk factor. Whether due to rodent infestations or facility overcrowding, the close proximity of animals in these settings appears to have accelerated the spread of the bacteria.
“We know that the boarding itself was a risk factor. It might have been rodent problems in those facilities, or it might have just been really overcrowded facilities with lots of dogs in close contact with one another.”
During the peak of the outbreak, some veterinary clinics reported seeing more than one case per day from dogs that had recently visited daycare facilities in the westside of Los Angeles County. Researchers analyzed 59 confirmed cases, identifying the pathogen as Leptospira interrogans serovar Canicola.
Shifting Perspectives on Vaccination
Before the outbreak, many veterinarians in the Los Angeles area considered the risk of leptospirosis to be low, given the region’s arid climate. Vaccinations were rarely offered as a standard practice. The 2021 surge proved that geography is not a safeguard against bacterial disease.
As vaccination rates increased and daycare facilities implemented stricter protocols, the outbreak eventually subsided. Major veterinary organizations now advocate for annual leptospirosis vaccinations for all dogs, regardless of their local climate.
Beyond the Daycare: A Growing Public Health Challenge
The threat of leptospirosis is not confined to high-end boarding facilities. Researchers are currently investigating cases in homeless encampments in Berkeley and Oakland. In these environments, the intersection of wildlife, environmental conditions, and roaming animals creates new pathways for transmission.
“This disease – there’s no boundaries for it,” Sykes explained. “We’re talking about dogs with this disease owned by wealthy people in L.A. And dogs that are in homeless encampments on the streets of Berkeley dying with this disease because of rodent exposure.”
FAQ: Understanding Leptospirosis
- What is leptospirosis? This proves a bacterial disease that can cause severe illness in dogs, including acute kidney injury, and can potentially be fatal.
- Can humans get it? Yes. Humans can contract the disease through contact with contaminated water or the urine of infected animals, particularly rodents or livestock.
- Why are daycares a risk? Crowded conditions and potential rodent presence in boarding facilities can facilitate transmission, even for strains that typically spread through environmental contact.
- Is vaccination effective? Vaccination is considered the most effective way to protect dogs and reduce the risk of transmission to humans.
As climate change leads to more frequent flooding, the environmental prevalence of leptospirosis is expected to rise. Experts urge pet owners to remain vigilant and prioritize preventative care. For more information on pet health and safety, explore our Pet Wellness Archive or subscribe to our newsletter for the latest veterinary research updates.
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