A dog stepped on a shotgun that was in his owner's car and killed him.
The accident happened over the weekend in Kansas.
The American media report it citing the police.
The 30-year-old man, sitting in the passenger seat, was shot in the back.
He was hunting with his dog and had left the weapon in the back of his pick-up where the animal was when the tragedy occurred.
In addition to mass shootings, gun accidents are also very common in the United States.
According to data from the US Centers for Disease Control and Prevention, such cases have claimed the lives of more than 500 people.