An argument over who would walk the family dog lead to a fatal shooting in Chicago this weekend.

According to ABC 7, a father shot and killed his 22-year-old son during a shootout at their home. The had previously argued about which one of them would walk the dog.

The father, 43, was hospitalized for multiple gunshot wounds and remains in critical condition. Police told the news station that his son was pronounced dead around 9:15 a.m. at Christ Medical Center in Oak Lawn.

Two weapons were recovered from the scene, and no one else was injured. Both men reportedly have criminal backgrounds.

The shooter and the deceased have not yet been identified, and it is not yet known what charges the father will face in his son’s death if he survives.