He knows it’s you, using his other senses, but also realize something is off.You’ve got a really good, trained dog. I know he knows the scent, but I’ve known a lot of dogs that wouldn’t be as chill as he is seeing someone with a mask on.Rocky is smart. He knows it is you from your scent. If I was him I would have grabbed the new “play toy” just to see how loud the squeaker was inside.This is exactly the same reaction when you scare your children with a mask. They know it’s you and your playing a game, but the mask is scary to them. after a short time they want to investigate the mask but are still scared of it, and never do get used to it.Dogs really are wonderful family members.Its so funny to see Rocky reaction.. Looks confused. Luckily you didn’t wear the whole costume, he may have tear you up because Rocky thought his dad being swallow up by the alligator 😂😅