The man, 62, was at his home on Randall Avenue in the Castle Hill section of the Bronx about 11:30 a.m., police said. The dog then bit the man in the left arm.
The pit bull mix was kenneled and taken to animal control in Manhattan.
This is the third dog attack this week and second one within 24 hours.
A boy, 5, was mauled by the family's two pit bulls in East New York Friday evening.
"The father was yelling and screaming, acting hysterical once he heard the dog biting on the baby," a neighbor told PIX11 News Friday night.
The boy, identified as Jeremiah Rivera by neighbors, is in critical condition, police said. He was taken to the nearby hospital but moved to another location for more extensive care.
Last Monday, a 75-year-old Long Island City woman was mauled to death by her mastiff-great dane mix.
(PIX11 - Feb 18, 2017)