thats actually everything my dog does. i only feed him twice a day as well, and no water laying out. he LOVES to eat the snow and like you said, throws off their peeing habits. mines done well with not peeing in the house either, just pooping. but he gives me no signs if he needs to... i guess what helps me is i have a condo so i have to take him out on a leash so if he pees, i try to stand out there with him longer to make him poop.
thanks!