Recent research shows veterans with posttraumatic stress disorder (PTSD) are twice as likely as other veterans to develop dementia. However, no studies to date have examined the impact of co-existing PTSD and dementia on family caregivers, who provide the majority of care to these veterans. Using the Stress Process Model, the current investigation explored the similarities and differences in psychosocial, health, and service use outcomes among caregivers assisting veterans with PTSD and dementia compared with caregivers assisting veterans with dementia only.