
Disney, experiencing one of the worst slumps at the box office in years, is counting on talking dogs and singing teens to turn things around. Among the movies it believes will put it back on top this fall are ''Beverly Hills Chihuahua,'' about a pampered pooch from the 90210 ZIP code lost in Mexico, and ''Bolt,'' an animated film overseen by Pixar Animation Studios guru John Lasseter about a showbiz dog. Disney is also releasing ''High School Musical 3: Senior Year,'' the third movie in the pubescent franchise and the first debuting on the big screen.