The amount of sleep that an animal needs depends upon its age, size, activity level and breed of dog. Some very large breeds of dogs, like Saint Bernards, Mastiffs, often spend a great deal of their lives sleeping,perhaps up to sixteen or even eighteen hours a day. For this reason, they were often referred to as mat dogs. Great Danes probably only dream about sleeping! Comparatively smaller breeds like Apsos, Dachshunds , Jack Russel Terriers etc need less sleep .
Question by - Sheetal Desai, Mumbai