The horror attack in Hamilton on Tuesday night left one victim with serious lower limb injuries.
Paramedics from the Scottish Ambulance Service also attended and one man was found seriously injured.
He was rushed to the Queen Elizabeth University Hospital for treatment, where his current condition is unknown.
A second man – who was mauled by the same dog on Loudonhill Avenue, shortly before the incident on Tinto View – was taken to Hairmyres Hospital for treatment for minor injuries.