Alright, thanks for the information. If cold is the root, then it could have been that. Its pretty cold up here right now and he was missing for a couple of weeks. A cold basement floor isnt the best for him im sure. I had a heat rock, but ive learned that its pretty detrimentle to there health as well(guy at petco recommended it), so it loks as though i should invest in a heat pad for the underside.