The ultimate in scratch-off lottery games for some dogs would be Leashtastic!, Lucky Leashes!, or best of all, Win 1,000 Leashes a Week for Life! Three-year-old Yellow Labrador Ian goes through leashes as if they are lamb kibble soaked in gravy . Yet Ian’s owners swear that they can never catch him in the act of dismembering his leashes. After his walks, Ian’s leash is always scrupulously hung behind the door and remains untouched until morning. But by evening, the leash is i