WTH IS MOVING UNDER THE SHEET

I have a LOT of animals to tend to and often have to shift them around while I clean their pens.. I had brought Grace, the bird, inside hours ago while cleanin monkey funk on the porch.. MUCH LATER I come inside and spotted something movin on the couch!! My Little Chihuahua Spanky loves to hide underneath of the sheet of the couch but I looked out on the porch and saw him so I knew he was not under there... To be honest I was kinda concerned as to WHAT was under there when I started filming!!!! There are enough cats at running in and out of my home it would not be unreasonable to think that one carried something in here!!! The only things I knew for a fact was it was alive and it was not my dog... It was a relief to see Grace.. These animals are going to put me in the hospital with a nervous breakdown..