Sounds like a snake. You're in Texas, it's probably a Texas Rat Snake. If you can catch the culprit, re locate it about 10-15 miles away to a safe forested area. We've relocated 5 this year. :S And 6 is currently in a holding box until we can get him relocated.

It took two people to get it in there, so I'll wait for my husband to get home to help me unload it. 
