Dogs again

5 pm walking in the snow along the SW trail a German shepherd sized dog came trotting across the trail from the south heading into the Woods.. female, black back, white chest. I ran at her. She turned, barked and a German shepherd with her ran back from the Woods. No collars on either. They had been running rabbits, and small game. I followed both by their tracks in the snow. They left the Woods via a gap in the fence just east of the trash station, then trotted east across the lawn to the dense willows and brush in the ditch extending south along the side of the waste treatment plant. Good cover and route south towards woods to the south. Not easy to follow.  I rang and left message with Animal Control .. but they have done nothing with previous reports of dogs in the Woods.. not an effective agency.