Moving can be stressful on everyone. Including your little four legged friend.
They don’t understand why their stuff isn’t where it used to be or where they are. If your little friend seems to be lost try spreading lavender scented items around the house, to help deal with the stresses of moving. Buy some lavender scented incense or scented Glade Plug-Ins ® and lavender refills for them.
Also make sure you have plenty of toys and stuff from the old house to make them feel more at home in the new place (like a few toys of theirs and maybe a bed or cat house for them to feel at home).
Most importantly make sure to make them feel welcome at their new home. Be sure to love on them a lot and make them feel like they are not going to be forgotten in the madness of moving.