PORT HURON, Mich. (AP) - One of the busiest and welcome volunteers at Port Huron's St. Joseph Mercy Hospital strolls the hallways on all fours. A therapy dog named Toby walks from room to room with her trainer Carolyn Crowe. She says Toby is a "rock star" to patients and hospital staff. She says Toby is an ex-leader dog for the blind whose calm personality and intuition make him a good fit at the hospital. Crowe has volunteered at the hospital since 1987. She started bringing Toby in 2008. In 2012, she started the Heavenly Hounds program. It's a group of people with therapy dogs who visit patients at medical facilities. Crowe was the St. Joseph Mercy Volunteer of the Year for 2012.