Deep inside every adorable domestic dog is a howling, drooling wolf enraged at the artificial human constraints of leashes, yards and living rooms. Even while puppies play with their Kong toys, their inner wild yearns to run, unrestrained, through forests so dense they blot out the sun; to dive into cold streams, emerging with bloody, thrashing fish; and to hump their chosen mates with canine abandon. Usually, they express all of this by pawing at the door and looking pathetic. Sometimes there's whimpering. Which makes the dog park at Penn Valley Park the town's best release valve for your dog's feral genetic memories. Roomy enough for Scooby to break into a full run at top speed, the park's 2.7 acres are surrounded with chain-link fence and include a separate enclosure for small or elderly dogs that might otherwise be trampled by the younger alphas. There are water fountains for both humans and hounds, and the hours are from dawn until one hour after dusk. Your best friend loves you and your den, but he definitely needs to interact with other dogs now and then, if only to remember where he comes from.