The animal also bit his colleague on the arm during the attack last month.
Details emerged as a judge blocked attempts to have its suspected owner charged with offences over the injuries inflicted.
According to police both officers were bitten after they stopped a man with a dog while on patrol at Botanic Avenue on December 29.
Michael John Gilbert appeared at Belfast Magistrates Court accused of two counts of assault on police, possessing herbal cannabis and resisting police.
The 31-year-old, of Castleton Gardens in the city, was also set to be charged with wounding and assault occasioning actual bodily harm.
PSNI officer needed emergency plastic surgery after being bitten on the face by dog, court told belfastlive.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from belfastlive.co.uk Daily Mail and Mail on Sunday newspapers.
Police officer needed emergency plastic surgery after having face bitten by dog, court hears belfasttelegraph.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from belfasttelegraph.co.uk Daily Mail and Mail on Sunday newspapers.