Skunks will use pet doors to get to pet food. They will hang out under your house if there is an entry point. A game/trail cam set up by an entry point will let you know when the animal goes in and comes out. You don't want to plug the hole with the animal under the house. Skunk trapping is not a trivial enterprise as they will typically spray and even if you take precautions to not get it on you it will be in the yard and stink for quite a while. (Odormute is a child and pet safe product to use to KILL the odor, not mask it.) Be careful, skunks can spray considerable distances.

Pat