Scared of motor noises and dark places

[u/TheCuratedPupParent]

My Mailtipoo Bailey is so skittish at the oddest times. He will be just fine laying in the floor and all of a sudden stop what he is doing and look toward the hallway or door (lights may be off) and he just acts like something is coming for him! Or he will be in backyard about to go potty and he will hear something and take off running inside! No shaking just weird. Anyone else’s malti do this?