I have 12 year old sulcata and she lives in Bandera, Texas (10F to 110F). She's grown to a point where moving her into the garage during our winter months is really not feasible. This summer I plan to build her a new permanent home outside (she uses a Rubbermaid shed now). My question is putting a heating mat underneath her ..... what about the urine and feces? Is there something I need to know?