A man visiting a friend at her San Francisco home was injured this morning, when two men instructed their dog to attack the guest.

It all began at around 2:50 a.m. Thursday, according to the San Francisco Police Department, when the 53-year-old victim arrived at a home on the first block of Dakota Street, which is part of the Potrero Terrace public housing complex.

The man, police say, was there to visit the 30-year-old female resident of the home, but when he arrived he was instead confronted by two 30-year-old males. "They got in a physical altercation," police say, punching and kicking the visitor.

Then, according to the SFPD, they "called on their dog (pit bull) to attack [the victim] as well."

The man was left with head injuries and lacerations, as well as dog bites to the arm and ankle, police say. He refused treatment for the injuries, which police say are not life-threatening.

According to the SFPD, no arrests have been made in the case. As of publication time, information on the status and location of the dog who was instructed to attack the victim was not available.

Related: Pit Bull Once Sentenced To Die Continues To Attack Other Dogs