Yeah, pretty much any moving object. She also has amazing focus on her target, even to the point of being obsessive. She is so much different in temperament from our other younger GSD. While Sasha is affectionate and mischievous, Milly is all about getting down to business and loves to work. She will just about fetch her Kong until she collapses from exhaustion. And although Sasha is softer in temperament she is the pack lead and Milly will defer to her.Originally Posted By: TrackingPuppyDoes she act the same way with any other object, your other dogs, children? Without more info it is hard to say.