My guy Leo is about to turn 8 months and has all of a sudden taking sleeping on his pee grate. We're using the Rascal Litter box http://rascaldoglitterbox.com/ (without the grass) and we're just about at the point where we want to ween him off of it (especially with this new development). Why in the world is has he taken to laying in his own pee? He usually wont do this when he's got a towel or blanket to lay on but I have also so seen him do it WITH a towel or blanket in his pen. Should I be concerned? Any ideas why in the world he's doing this??? My understanding is that dog's generally don't sleep where they use urinate or poop. What's going on?