A 71-year-old man was found "covered in blood and with numerous injuries" after a dog attack on the front lawns of Old Parliament House on Wednesday, police said.
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Police were called to the scene about 10.40am after receiving reports of two men fighting, with one man beating the other with a large stick.
When they arrived, police found the victim bloody and injured and he was taken to Canberra Hospital for treatment.
The Parkes resident said he had been attacked by a man and his dog - believed to be a bull mastiff, or a similar breed - which he claimed had mauled him.
"It is alleged the offender threatened to attack him further," police said.
Police arrested a 40-year-old man at about 12.15pm and charged him with assault and allowing a dog to attack a person.
The man was notified his dog would be seized by Domestic Animal Services.
He will face court next month.