Some dogs whimper or bark in their sleep, while some will sleep perfectly still. And some dogs may choose to sleep in a certain place
in the home and only in that place, while other dogs can sleep almost anywhere. Sleeping styles can be unique to different breeds or even individual dogs.
Certain breeds sleep more than others, which can be troubling to some pet owners with more than one breed of dog. You may wonder why your golden retriever sleeps 12-14 hours per day while your greyhound snoozes for 18 hours plus.
Greyhound Sleep Patterns