The amount of time spent napping varies fromdog to dog and depends on the dog's age andpersonality. Counting little naps and longersnoozes, most puppies sleep from 18 to 20 hoursa day. As your puppy ages, he will sleep less.Adult dogs sleep about fourteen hours a day.
The various breeds of dogs also seem to have different sleep
requirements. Some very large breeds of dogs, like Newfoundlands,Saint Bernards, and mastiffs, often spend a great deal of their lives sleeping – perhaps up to sixteen or even eighteenhours a day even as adults.