A 12-year-old German Shepherd—who walked through his invisible fence in Missouri and disappeared for 72 hours—is safely home after a harrowing ordeal. Maverick left his yard, only to fall into a nearby sinkhole, and it wasn’t until his owner heard a faint barking sound that he was discovered. It took rescuers almost two hours to dig the poor pup out, and then he was rushed to the vet for treatment. And it wasn’t Maverick’s first brush with death. . .