The 90 pound yellow lab was in the backyard while the Donizio family was at work.
They think they coyote hopped their six-foot fence and attacked Molly the dog.
Her family found her covered in blood later in the day.
After spending the night at the veterinarian's office, Molly is home and recovering.
Colorado Parks and Wildlife says coyotes can be just as aggressive with big dogs as they are small dogs. They are also very territorial animals.