A Calgary dog owner has been charged and faces a possible $10,000-fine after his pit bull seriously injured a 61-year-old man on Thursday.

The man was bitten in the face, losing part of his lower lip. It happened in a house in Calgary's northeast community of Monterey Park around 7 p.m. MT.

"What we've been told is the dog had escaped from the room that it was locked into and bit the person on the lower lip area causing quite a severe wound," said ABS operations co-ordinator Doug Anderson.

Douglas Anderson of Animal and Bylaw Services

Douglas Anderson of Animal and Bylaw Services says the man was visiting a home when the family pet got out of a back room and attacked him. (CBC)

Animal and Bylaw Services (ABS) says the dog owner has surrendered the dog, which will be quarantined for 11 days.

"The seizures for the City of Calgary are actually about half of what they were last year," said Anderson.

"The unfortunate part is that the bites have gone up a bit, but the seizures of the dogs — I believe — is probably due to the fact that some of the bites have been more serious than what we like to see."

The dog’s fate has not yet been decided, the city says.

“Whenever someone visits your home, whether for personal or work reasons, pet owners need to ensure their pets are under control at all times,” said officials in a release.

“All dog owners are responsible for not only the safety of their dog, but the safety of those who come into contact with their dog.”