9 hours of sleep are key to dogs' happiness & health: Let them nap the day away

9 hours of sleep are key to dogs' happiness & health: Let them nap the day away

9 hours of sleep are key to dogs' happiness & health: Let them nap the day away.Sleep plays 'significant role' in dogs' wellbeing, study reveals (Image: Getty) Sign up for FREE for latest news plus tips to save money and the environment.