In the Guadalix mountains outside Madrid, Argentine horse whisperer Fernando Noailles uses his animals to help people suffering from stress and anxiety.
The 57-year-old, who spent many years in the Patagonian wilderness living with horses, uses the animals as a way for patients to interpret and control their emotions.
"Fernando sees the reaction of the horse - he can tell if I'm centred in the moment, how I feel. He uses the horse as a guide to let him know how the session is going," she says.
Writing by Sonya Dowsett