
Shelly May suffers with lupus, a debilitating autoimmune disease.

In addition to joint pain, lupus can affect the skin and internal organs. May, who was once a professional dancer, also has bouts of depression and anxiety.

The 32-year-old sets out props for an activity at the Ortega Center in San Juan Capistrano, a city 50 miles south of Los Angeles.

"Some clients have deep attachment issues," says Carol Caddes, a therapist and counselor for Otra Mas who helps run the program.

"They don't know how to fit with a group or how to really bond with another human being," Caddes says.

When horses begin responding to a person, this can help a patient identify and confront their issues, Caddes explains.

Most horses at the Ortega Center have been donated -- many are old show horses.

"You see how horses interact with each other and it's similar to how people interact with each other," says May. "They're non-judgmental and don't take things personally."

Animals such as horses have long been used in therapy.

May discusses a recent equine-assisted psychotherapy session with members of Otra Mas at the Ortega Center. Any observations noted during therapy can be brought up in later debriefs.

More than 200 people have taken part in therapy at Otra Mas since it opened in 2013.

It has treated people suffering from depression and anger-management issues, and ex-military personnel trying to cope with post-traumatic stress disorder.

"I think it helps me go through a lot of my physical pain by myself instead of being so dependent on others to take me out of the emotional pit," May says.

"It taught me to let a lot of things in my life go," May added.