Gardai have yet to comment on the video.
Footage of the moment a Garda discharged his firearm injuring a man (20s) and killing a dog near Granard in County Longford, has emerged on social media.
GSOC are investigating as a Garda firearm was discharged after Gardai attended the incident in the town at around 5pm.
A local man has been treated in hospital for minor injuries which are not said to be life-threatening.
The video (which we have not included here) shows two men involved in a tussle beside a van before one man discharges his pistol which appears to hit the other man in the foot.
All faces in the video have been pixelated and the sound has been muted.
Gardai have yet to comment on the video.