If the skin goes down slowly or stays up, then ya got a dehydrated cat on your hands. If you ever see this, the
cat will need syringes of water until you can get the
cat to the vet. You can get syringes from the vet or your local pharmacy. All pet owners should have one on hand.
Here are some suggestions on keeping nosey kitty out of the trash. Put something heavy in the bottom of the trash-harder to knock over.