The Humane Society of the United States’ Pets for Life (PFL) program is working to address inequities in access to pet-supportive services (e.g., veterinary care, behavior training, basic supplies) by providing direct care to people and pets in 40+ communities experiencing poverty across the U.S. The Institute for Human-Animal Connection (IHAC) is partnering with PFL to conduct research that promotes greater recognition within the animal welfare field of how institutions produce and perpetuate unjust systems and policies. To inform future work that advances equity in historically and systemically marginalized communities, IHAC has conducted a series of studies to examine how the PFL program can promote the health of an entire community under the One Health framework. This presentation will include a discussion of the findings of two of IHAC’s studies that validated survey instruments, including the One Health Community Assessment (OHCA) and the Cultural Competence Inventory, to understand how increasing access to pet support services for underserved communities contributes to the health of the humans, animals, and the natural environment of a community. The findings from these studies demonstrate how service providers that operationalize social work best practices can increase underserved populations’ access to community-based programs, which results in measurable increases in One Health outcomes.