Paramedics found the 40-year-old man with a deep laceration to his chest when they arrived at the “chaotic scene” in Sylvania this morning.
The dog was restrained before paramedics treated the man at the scene.
It is not known if the dog has been seized by the council.
NSW Police has been contacted for comment.
The man has been taken to St George Hospital in a stable condition.
“Our Medical Specialist Team were able to complete an ultrasound on his chest to determine the extent of his injuries.”