関連ワード:  why do dogs lick when sleeping    why do dogs lick when falling asleep    why do dogs lick lips when sleeping    why do dogs lick you when sleeping    why does my dog lick when sleeping    why do dogs lick their mouth when sleeping    why do dogs lick at night when sleeping    why do dogs lick the floor when sleeping    why do dogs lick the air when sleeping    why do dogs lick before sleeping