A day after Fairfax County Fire and Rescue crews saved a dog who fell through the ice at Reston’s Lake Thoreau, personnel were out on Lake Audubon practicing for more ice rescues.

Firefighters often conduct drills on the lake, particularly in the limited time the water is frozen each winter.

They also warn people and pets to stay off the ice so that rescue won’t be needed. The ice on Reston’s lakes rarely freezes solid enough to hold people (or in Wednesday’s case, a 75-lb. dog), Fairfax County Fire and Rescue officials said.