On Friday he met with 2-year-old Golden Retriever Jasmine, who can sense when her owner, Air Force veteran David Romero, has a PTSD attack coming on – and alert him to it so he can take preventative medication.
Harry – who previously bonded with an adorable dog on his trip to Nepal in March – came face-to-whiskery face with the pup as he toured the pool area of the Invictus Games site.
Want to keep up with the latest royals coverage? Click here to subscribe to the Royals Newsletter.
Harry crouched down and greeted the dog as former airman Romero, from nearby Celebration, Florida, explained how Jasmine can smell the pheromones that are signs an attack is coming on.
"I told him what she does and he joked ' I need one of these!' " Romero tells PEOPLE.
The dog was given to Romero after he had a stroke that was caused by his PTSD. She has since alerted him to take medicine five times.
Romero, 46, who is a software engineer at Disney and is volunteering at the games that start on Sunday, served in the Air Force for six years until he was suffered leg injuries in a car accident more than 20 years ago and has struggled with PTSD since too.
Harry has been highlighting the difficulties faced by those with mental health issues, as well as veterans who have physical injuries. Before the games kick off on Sunday, there will be a symposium on invisible injuries at the site.
"The prince has helped change the view of veterans like me who've got invisible injuries," Romero tells PEOPLE. "These guys have given me such inspiration and I'd like to try out for next year's games. To have the prince backing us on it gives the world visibility to it."
Tickets for the games are on sale via the official site.
To read a full interview with Prince Harry, pick up the latest issue of PEOPLE, on newsstands now