I have noticed that D.C. likes to chase spots of light. First he would go after spots on the roof of the truck when the sunlight hit my watch. Now I take a flashlight and he chases that spot of light all over the yard at night. He will keep chasing as long as I have the gumption to hold that Mag Light over my head (they get heavy after a while!). Anyone else out there play Boxer flashlight tag?