More than 270 dogs are competing this weekend at the eighth annual Mount Hood Doberman Pinscher Club’s all-breed agility trial at the Dr. Jack Giesy Arena at the Clark County Event Center. The trials, sanctioned by the American Kennel Club, are free to the public from 8 a.m. to 6 p.m. Sunday. Dogs and their handlers compete for time and accuracy through two different obstacle courses, which include jumps, tunnels and seesaws.