Rotary Grove is listed as a dog park in Belmont, North Shore City, Auckland, with a Google rating of 4.3.
A good dog park gives dogs space to run and meet others while keeping owners in control. Look for clear boundaries or signage, water for the dogs, and some shade on warm days. Before you go, check the rules for the specific site, because Auckland has set off-leash areas and times, and a dog allowed to roam in one reserve may need to stay on a lead in the next. Regulars know to keep their dog's recall reliable, carry bags to pick up after it, and watch how a dog is behaving before letting it join a group. Quieter times, often early morning or mid-afternoon, suit nervous or older dogs better. North Shore reserves can get muddy after rain, so towels in the car are handy.
For dog owners in Belmont, Rotary Grove is a well-rated local spot to check out with your dog.