Five U.S. hospitals will be part of a unique clinical trial to see if animal-assisted therapy helps reduce stress and anxiety among pediatric cancer patients, as well as their parents and guardians. Physician Janice Olson of Randall Children's Hospital in Oregon said she frequently prescribes pet therapy to pediatric patients, and if the study confirms it reduces stress, the findings can be used by other facilities. "I love it when the dogs come to the inpatient services," Olson said. "It's so nice to have the doggies wagging their tails. It pulls the stress level of the staff down. The kids really enjoy it and are surprised to see animals in the hospital."