Riverhead Animal Shelter Youngs Ave, Riverhead, NY11901 The Riverhead Animal Shelter is a municipally operated shelter for up to 20 dogs and its staff is in charge of…More picking up stray dogs throughout the town. The shelter is open daily and located on Youngs Avenue off of Osborne Avenue. A lost-and-found board in the shelter office is available for those searching for a lost pet. The shelter welcomes volunteers to walk the dogs. Volunteer applications are available on the shelter's website.