The Olate Dogs canine act has been declared the Season 7 winner of the NBC competition series \"America\'s Got Talent.\" The performing pups -- and father-son trainers Richard and Nicholas Olate -- won the top prize of $1 million. They will also headline a show in Las Vegas. Comedian Tom Cotter took second place in Thursday night\'s finale, which featured guest appearances by Blue Man Group, Justin Bieber, Green Day, Ne-Yo, Joan Rivers, Flo Rida and One Republic. The show\'s host is Nick Cannon, and its judges are Howard Stern, Sharon Osbourne and Howie Mandel.