Harley, a five-year-old Pug, lost his eye in an accident but made a quick recovery, said doctor Lucia Ledesma, head of mental health services at the Institute for Social Security and Services for State Workers, the agency of which the hospital is a part.
"We follow that example of resilience in the face of adversity. He's a dog that does everything, without impediments," she said.
The facility is the only public hospital in Mexico using animals to treat mental illnesses, though such therapy is also practiced in other countries.
"Contact with animals generates powerful neuropsychological changes that contribute to lowering states of stress and anxiety, as well as benefiting other cognitive processes," Ledesma said.
Harley became famous in Mexico when he entered Covid-19 wards wearing a protective suit, booties and glasses to boost the morale of medical personnel working long hours away from their families.
"It was the only animal-assisted intervention in the world within a Covid area," Ledesma said.
"There were dogs in hospitals in other countries, but they never entered the Covid zone. We've received international recognition."
Silvia Hernandez first met Harley when she was working as a nurse during the pandemic, which left her with mental health issues for which she is still undergoing therapy.
"He came straight to me, as if he knew me, as if we were great friends," she said.
"We could see colleagues becoming emotional and feeling that love, that gesture of Harley to release their tension. Some of them cried," Hernandez recalled.