Oscar the Grouch, a cow, a canine-riding caveman and William Shatner from Star Trek paraded through the halls of Fairbanks Memorial Hospital this week, visiting patients. They were all costumed canines from Companions Inc, a local nonprofit that provides pet therapy support around the borough — from the hospital, to Denali Center, Alaska Pioneers Home, Fairbanks Senior Center and even meeting students at the University of Alaska Fairbanks during finals week. At the North Pole