A new study reveals that training service dogs can slow biological aging in female veterans. Researchers from Florida Atlantic University, in partnership with other institutions, focused on women with post-traumatic stress disorder (PTSD)—a group often overlooked in military research. Instead of receiving a service dog, these participants volunteered to train dogs for fellow veterans, offering support to others as well as themselves.

To measure biological stress, the team looked at telomere length (a marker of cellular aging) using saliva samples, and heart rate variability (HRV), a sign of nervous system balance. Over eight weeks, female veterans were randomly assigned to either an active service dog training group or a comparison group that watched dog training videos. Both groups participated in weekly one-hour sessions, and researchers measured outcomes before, during, and after the intervention.
Saliva samples were used to determine telomere length, while heart rate variability provided additional insight into physiological stress. Results showed that those who trained service dogs had an increase in telomere length, indicating slower cellular aging, while the control group experienced telomere shortening and accelerated aging. The benefits of telomere preservation were most significant among women with a history of combat exposure; this subgroup saw the largest gains in telomere length, whereas combat-exposed control participants had the most pronounced declines.
Heart rate variability findings further backed the biological stress benefits, with those in active training demonstrating improved nervous system regulation. Psychological measures were also gathered using standardized questionnaires to assess PTSD symptoms, anxiety, and perceived stress. Both groups reported reductions in these symptoms throughout the study, suggesting that structured activity alone provides some mental health support. However, improvements in psychological outcomes did not differ significantly by intervention or combat experience.
The study, published in Behavioral Sciences, suggests that the skills learned during service dog training—such as positive reinforcement and reading animal behavior—may have strengthened participants’ bonds with their own pets at home, offering additional emotional support. Unlike general volunteering, service dog training uniquely blends emotional healing with building a close relationship between veterans and their animals, providing therapeutic benefits that go beyond typical community engagement.
Source: Biocompare.com

















