Dirty Tricks - Duz Shedd, 4 Author:Marjorie Weinman Sharmat Wag that tail! Fetch that mail! Duz's new exercise video is sure to be a hit--until his feline rival, Geca, steals his ideas and gets her video out to stores first. Now it looks as if Duz copied Geca! How can Duz prove that Geca's the real copycat?