The emergency services were called to reports of a dog attack in Great Yarmouth.
A man, believed to be in his 40s, was left with serious injuries to his arm after the incident in Queens Road, Great Yarmouth.
An eyewitness reported seeing a man near the scene with a t-shirt wrapped around a blood-soaked arm.
A Norfolk police spokesman said they were called to the scene just before 12.30 yesterday for a public safety check.
A spokesman for the East of England Ambulance Service Truts (EEAST) sent an ambulance crew to the scene, to assist a man with arm injuries.
The East of England Air Ambulance (EEAA) was also dispatched, and was seen circling above, but it was stood down before arrival and headed back to base.
Police said the man got in a car with friends and the ambulance service said he presented himself at the James Paget Hospital.
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