The man, from Memphis, Tennessee, was asleep beside his female partner when he was shot early Monday morning, escaping with a graze to his left thigh that was treated in hospital.
Police report said the dog — a year-old pit bull named Oreo — got his paw stuck in the trigger guard and ended up hitting the trigger.
It did not specify the type of weapon fired, and recorded the incident as accidental injury.
In 2018, a 51-year-old man from Iowa was shot in the leg by his pit bull-Labrador mix.
Reports said the Tennessee victim’s girlfriend, who was not named, as saying she was sleeping when the gun went off.