""With some dogs you share a boil in the bag breakfast and maybe a blanket on a cold desert floor. Some you wouldn't leave in charge of your Grandma unless you wanted to find out just how fast the old girl could run. But, if you're very, very lucky there will be the one dog you would lay down your life for - and for me that dog is Buster." Buster, an English springer spaniel who has served his comrades and his country with unstinting devotion, has...