How many hours do dogs need to sleep a day?

Dogs sleep for about 10 hours a day, puppies sleep more, at 15-20 hours, adult dogs sleep less, also 10 hours, and older dogs about 12 hours. In addition to sleeping all night long, dogs will also sleep whenever they are bored, with more concentrated sleep time around noon. Dogs sleep for different lengths of time each day, but adult dogs should not sleep less than 8 hours a day. Dogs generally sleep in a shallow state and will wake up at the slightest sound, but there are times when they are asleep.