Loyal bomb-sniffing dog honored for his bravery

British soldiers and military dogs gathered at a London army barracks on Thursday to honor a fallen hero with selfless courage, nerves of steel -- and four legs. Theo, a bomb-sniffing Springer Spaniel who died in Afghanistan on the day his soldier partner was killed, was posthumously honored with the Dickin Medal, Britain's highest award for bravery by animals. Theo worked alongside Lance Cpl. Liam Tasker, searching for roadside bombs in Helmand Province, a Taliban stronghold. Tasker, 26, died in a firefight with insurgents in March 2011, and Theo suffered a fatal seizure hours later. Tasker's mother, Jane Duffy, says the pair were inseparable. She's convinced Theo died of a broken heart. "They'll be watching us, and they'll be so proud," she said. "I just wish they were here to get it themselves." Since 1943, the Dickin Medal has recognized gallantry by animals serving with the military, police or rescue services. Here's a look at some of these animal heroes:

Theo is the 28th dog to receive the medal, awarded by animal charity PDSA and named for its founder, Maria Dickin.

One of the earliest winners was Rip, a mongrel found abandoned in a bomb shelter and adopted by a London air raid warden. He was credited with finding more than 100 people trapped in rubble by German bombs during the 1940 Blitz.

Another World War II hero was Rob, a collie who joined British commandos in more than 20 parachute operations behind enemy lines in North Africa and Italy. His medal citation said that "his presence with these parties saved many of them from discovery and subsequent capture or destruction."

Dogs have also been honored for service in Bosnia, Iraq, Afghanistan and during terrorist attacks. After the Sept. 11 attacks, Apollo, a New York Police Department German shepherd, received the medal on behalf of all search and rescue dogs at the sites in New York and Washington, "for tireless courage in the service of humanity."

Pigeons' homing instinct makes them excellent messengers, and more than 200,000 served with British forces during World War II. About 32 were awarded the Dickin Medal for carrying back vital information from the frontline. Feathered medal-winners include Gustav, a pigeon serving with the Royal Air Force, "for delivering the first message from the Normandy Beaches from a ship off the beach-head" on June 6, 1944, the day of the D-Day landings.

GI Joe, a member of the U.S. Army Pigeon Service, was honored for flying 20 miles in 20 minutes with a message that stopped U.S. planes bombing an Italian town occupied by British troops in October 1943, saving the lives of at least 100 Allied soldiers and many civilians.

Only one cat has ever received the Dickin Medal. Simon, a Royal Navy ship's mascot, was honored for his service on HMS Amethyst, a ship shelled by Chinese Communist forces on the Yangtze River in 1949. Despite being seriously wounded by shrapnel, Simon returned to his rat-killing duties aboard the damaged ship, which was trapped for months in Chinese waters. "Throughout the incident his behavior was of the highest order," the citation said. Simon and the ship's crew were greeted as heroes when they made it home, but Simon died weeks before he was due to receive his medal.

Upstart, a London police horse, is one of three equine recipients. He was honored for a World War II incident in which he maintained his composure to help control traffic despite having a German flying bomb explode 75 yards away, "showering both horse and rider with broken glass and debris."

ASSOCIATED PRESS