 KVAL | Pit Bull shot and killed by police had a history of aggression KATU PORTLAND, Ore. - Police say a Pit Bull that was shot and killed by one of their transit officers had a history of biting and should have been on a leash and muzzled. "We're seeing, as we look back, a pretty distinctive pattern of behavior for this ... Dog shot and killed by Portland police had a history of biting, aggressive ... Pit Bull Shot By Portland Police Officer At TriMet Station Officer shoots, kills dog at N Portland bus stop |