We bought a medium- sized dogloo, filled it with straw, added an electrial outdoor heated kitty pad, & a plexiglass-door to keep out the worst of the elements. Initially it was quite the hit, but when we put up a double Rubbermaid container, also with straw & a heated pad, & an even smaller opening, our regulars flocked to that (understandably). I don't want to too a $95 house & am trying to come up with ways to add to its insulation. ( NOTE: im in the suburbs, but both are hidden behind our gggarage so looks/drawing attention not an issue) Could we use spray insulation either inside our outside the dogloo? Would it crack off? Is it toxic? Should we try tacking Mylar sheets up inside? Any suggestions appreciated! Or are we better off surrounding both the dogloo & the double-Rubbermaid with small bales of straw? We hate to keep disturbing things too much ( the Rubbermaid shelter is in use almost 24/7. Any is vice appreciated!