Dogs Bark At Parked Car For Days, Then Locals Look Inside

Imagine walking through a quiet neighborhood one evening, when suddenly you hear the incessant barking of dogs coming from a nearby parked car. At first, you brush it off as just another case of dogs being dogs. But as the days go by and the barking continues, curiosity starts to gnaw at you. What could possibly be inside that car that has the dogs so agitated?