The pier is a roosting spot for shags as evidenced by the droppings along the fenceline. Susie loves stirring them up.
She drops over to say g'day to these two dogs. All three of them go berserk running back and forwards barking incessantly with teeth bared. If the gate was open it would seem that they would tear each other apart. After about 30 seconds she tires of this and come trotting back over to me, her work done.