(Portland, OR) -- Portland Police have arrested a man who's accused in a bias assault against three people. On Sunday, 29-year-old Zachary Hay was near Southwest 13th and Alder when he allegedly called a Black man a racial slur and had his dog attack the man. The victim suffered significant injuries to his chest and hand. A second victim, a white male, was also injured. Police believe a third victim was also attacked in a separate incident, but that person hasn't come forward. Police later arrested Hay on two charges of Bias Crime. His dog was taken into custody by Multnomah County Animal Services. Police want to hear from anyone else who was attacked by Hay or his dog.