Sioux Falls Animal Control say a young man was bitten in the left thigh by a large dog Monday evening.
It happened in the alley between between 10th Street and 11th Street, west of Duluth Avenue and east of Summit Avenue.
The dog ran away after the bite and they haven't found him.
Animal Control believes it was a large black Labrador Retriever weighing between 80 and 100 pounds.
They don't know if the dog had a collar or any vaccinations.
They don't have any other description.
If you can help identify the dog please contact Sioux Falls Animal Control at (605) 367-7000.