The neck was easy enough to scale, much like the leg, the thick fur acted as a colossal climbing tree with little effort required as you ascended to the top of the head. You do eventually come to rest just above the dog's eyes and consider your next move carefully. You could try calling the dog from inside its ear, climb down to its eye or brave the journey down its snout. You could also wait here for it to get home before you tried anything brash...