Was the light bulbs changed recently? Maybe brighter now? Or there could be a bug flying around near the light? Sometimes they can be sensitive to light too. Not sure why this is happening all of a sudden. However dogs do pick up on things we can't . They are more sensitve to sounds and visual stimuli then we are.
__________________  "No matter how little money & how few possessions, you own, having a dog makes you rich."  |