関連ワード:  why do dogs lick when falling asleep    why do dogs lick their lips when falling asleep    why do dogs lick before falling asleep    why do dogs lick their lips before falling asleep    why do dogs lick their mouth before falling asleep    why does my dog lick his lips when falling asleep    why does my dog lick before falling asleep    why does my dog lick to fall asleep    why does my dog lick me before falling asleep    why does my dog lick me while falling asleep