PRINEVILLE, OR -- Fire heavily damaged a Prineville home, yesterday. At about 11:30 a.m., fire crews responded to the home on East First Street, and found the upstairs fully involved.  The downstairs was full of  smoke, as well.  No one was home at the time, but firefighters rescued three dogs and a cat from inside.  Investigators believe the fire started in an upstairs bedroom, but the exact cause is not yet known.