My Little Pony friendship is magic season 1 episode 5 "Griffon the Brush-Off"
Season 1 episodes: http://www.youtube.com/watch?v=IsXXLi12DHs&feature=share&list=PL86C048B0020CD51C

Season 2 episodes: http://www.youtube.com/watch?v=f2QtCA1JISQ&feature=share&list=PL86C048B0020CD...