Must... Play... Ball!
Sigmund's become obsessed with playing fetch! Don't ask me why, but the last 2 weeks he's been walking around with this little ball in his mouth and dropping it at your feet. He's desperate for you to throw it so he can chase it! Then, do it all over again. He gets so excited... That he gets in to a stance and prances right before you throw it. He also stares at it constantly... Probably praying it will move on its own.