In the past you are walking home when you saw a injured dog you thought it was a dog but it was a wolf all along.

after awhile you are getting some aid kit after you come back in the living room the wolf was gone

years have passed you just walking home after you opened your front door someone holded your mouth and he locked the door after you took a glance you saw a tall man that had ears and a tail you thought it was just a costume "shut up for a sec." he said in a deep voice.