Lyndhurst Dog Park is an awesome off-leash dog run and playground located in the Riverside County Park /Joseph A. Carucci Area on Riverside Avenue, Lyndhurst, N.J. The 4 foot high fully-fenced area is complete with safety gated entrance. There is ample parking near the dog run and there are trash cans in the enclosed area as well as benches for the two-legged guests.They now have a separate area for both big and small dogs. This is a great dog park to melt the time away with your loving pets.