A man is on the run after stabbing his brother in the chest at a south Sydney home.
The brothers, both aged in their 40s, were reportedly at their parents home in Kogarah Bay when they began arguing over a greyhound dog.
The younger brother than allegedly attacked the older brother, knifing him in the chest.
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The 46-year-old man was rushed to intensive care at St George Hospital, while the younger brother remains on the run.
A crime scene has been established at the Lacey Street home as investigations continue.