My cat is VERY loving, except when my girlfriend and her cat are visiting. Her cat is very sweet and is not aggressive towards my cat. However, when she and her kitty are over, my cat refuses to come in. I hate seeing this especially when it is cold and rainy outside. Long story short, I bought him a cat house (dog house, really, shh don't tell) and filled it with a soft blanket and pillow. But he refuses to go inside. I've put food inside, too. No go. Today, he just sat outside in the cold drizzle on cold concrete only a foot away from a warm, new house. Any ideas to make him feel comfortable?