It's one more in a handful of reported dog attacks in the city in recent days.
Officials say the tot was in the backyard of a home when she was bitten by the dog, which belonged to a family friend.
The girl was taken to hospital and treated for a serious bite to the face, while the dog was seized by bylaw officers.
Over the weekend, a Staffordshire bull terrier attacked and killed a poodle out for a walk with its owner.
And last Friday, a woman was bitten on the face by an Australian cattle dog.