A few adults jumped out of vehicles that were passing by to help the boy and seize the dog.
A photo taken after the attack shows the left side of the little boy's face with several bite wounds.
The dog was reportedly returned to its owner and the Spring Valley police department is looking into the incident to determine whether the dog has a history of violence, the New York Daily News reported.
The toddler, who has not been publicly identified, is a young Jewish boy, according to the Orthodox Jewish Public Affairs Council (OJPAC) of Hudson Valley.
The OJPAC claims the dog's owner has let the dog outside without supervision numerous times in recent weeks.
"Neighbours say they have called the Spring Valley PD (sic) about this multiple times but little action has been taken," the council said on Twitter.
Due to media pressure the dog has now been seized as police investigate the incident.