medium-sized, dark brindle dog at a dog park

medium-sized, dark brindle dog at a dog park. The dog has a white spot on its chest and a light green collar. It approaches a circular dog agility obstacle made of a metal ring suspended between two poles. The ground of the dog park is covered in small brown pebbles. In the background, tall apartment buildings are visible under a clear blue sky. The dog sniffs the orange connector on one of the poles, then looks directly at the camera.