With its miles of trails and acres of lawn, Prospect Park is doggy paradise. There are even off-leash hours from 6 a.m. to 9 a.m. and 9 p.m. to 1 a.m at the Long Meadow, Nethermead, and Peninsula Meadow. But nothing in all of Brooklyn compares to Dog Beach, which is reserved year-round for the exclusive use of the park’s four-legged visitors.