In 1923, the Brazier family traveled from Oregon to Indiana, bringing their 2-year-old collie/shepherd mix, Bobbie. They were separated in Wolcott, Ind., when Bobbie was chased off by a group of local dogs, and after three weeks the family reluctantly returned to Oregon. Exactly six months later, the family’s youngest daughter was walking down a Silverton street when she recognized a bedraggled dog. At her voice he “fairly flew at Nova, leaping up again and again to cover her face with kisses and making half-strangled, sobbing sounds of relief and delight as if he could hardly voice his wordless joy.”...