Four days after an avalanche killed his master and buried him alive, a little Welsh Corgi dog named Oly walked out of the wilderness and into the arms of Cooke City rescuers, who brought him home to his grieving family in Bozeman. “It’s bittersweet,” said Kerry Corcoran Gaillard, whose husband, David Gaillard, was killed by an avalanche Saturday when the couple was cross-country skiing. “I was excited” to get Oly back, she said, “but it amplified the loss of Dave a little bit. You automatically wish it could be Dave.” David Gaillard, 44, was the Defenders of Wildlife Northern Rockies...