For the most part Joel isn't scared of much. Maybe if he's around a new person and they jerk or drop something he'll jump, and fireworks make him shake like a leaf.
But the most thing he is scared of is the strangest thing, if you make a toy walk towards him lol I don't know how he even knows that it's creepy, no one teased him about it he just knows it's weird. He will growl at it and hide
And for Roxy, garbage bags. Full or empty, any kind of garbage bag haha!