My corg-bull (cogi-english bulldog mix),Whiskey, is 3 months old, and has developed a new obsession. Whiskey has recently started to become obsesses with chasing shadows. If we walk him at night, he is so concerned with the moving shadow rather than going potty. At night when it is time for bed, he will chase our shadows as we go around turning off lights and doing our nightly routine. He will then lay at the foot of the bed and keep moving and hoping for a shadow. This new obsession was funny when it first started, but not anymore!! I wonder if this is his herding instinct coming out!!