A 55-year-old man is fighting for his life after being attacked by a dog inside a Sydney unit.

A neighbour called emergency services to Pyrmont Bridge Road in Camperdown about 10am over a dog attack.

Police had to force their way inside the unit to get to the man, who was on the balcony. 

He had suffered serious arm and leg injuries.

The man was treated at the scene by paramedics before being rushed to Royal Prince Alfred Hospital in a critical condition.

The City of Sydney Council has seized three dogs from the home.

Police are investigating the incident.

9news.com.au has contacted council for further comment.

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