They are scared of life. Ok bad joke. Marbs isn't really scared of much, maybe loud, sudden noises. She will hang out if there's strangers. She'll also stick around the vacuum but run if it gets too close. Sometimes she'll get scared if I go overboard on yelling at her for being bad. Mia is scared of loud noises and strangers at first. I assume she's afraid of the vacuum too since she's never around when I do it. She's not quite as brave as her sissy, never has been.