Buzz, an American Pitbull Terrier (L) and Baby Girl, a Boxer walk with their owner Dave Sanderson during a Tucson shooting anniversary event in Tucson, Arizona January 7, 2012. Survivors of a deadly mass shooting that gravely wounded U.S. Representative Gabrielle Giffords on January 8 last year will join thousands of Tucson residents at emotional memorial events this weekend. A gunman toting a semiautomatic pistol pumped bullet after bullet into a crowd gathered for a congressional outreach event outside a Tucson supermarket a year ago. Six people were killed and 13 suffered bullet wounds. Giffords was shot through the head and is recovering. REUTERS/Joshua Lott (UNITED STATES - Tags: POLITICS CRIME LAW ANNIVERSARY ANIMALS)