My cat is a 14 year old fixed male tabby in fairly good health. Through his life he has come in and out as he pleases. For the past week he has wanted to stay outside, but he will sit by the door and meow to come in. When we open the door, he will stand on the threshhold, but remain outside. If I carry him in, he will immediately want to go back out. Last night we put him in until he pulled down the curtains trying to get back out. He has never done this before and I am starting to get concerned, he appears to be healthy except for this insane behaviour. Has anyone ever seen a cat do this before? I am starting to get concerned. There are no new members to the household,and no changes at all but my wife is 12 weeks pregnant. What the heck?