Since I had my Pablo I never heard him hiss. I heard him sneezed once. That was after I gave him a bath. My Pablo loves to hide in his half log and if I put in his branch log he never gets out, I have to wiggle him out. One time when it was feeding time he was in his branch log and I HAD to place his pinkies at the entrance o it but he didn't move until the pinkie went into his log. I think that was his first lazy day.