Seaside Beach is pet-friendly. This stretch of sand is a great place to come, hang out and play in the surf with your pup. Dogs are welcome to play on the beach without the constraints of a leash at Seaside. Dog owners are reminded to pay close attention to their pup as they play and to clean up any mess that is left behind. If the beach is crowded, it's probably best to put your pooch back on a leash.