Did this behavior change start around the same time you had a friend over? The reason I am asking this is because maybe there was something he smelled on your friend that scared him. One of my cats does not like it when my hubby puts on a specific aftershave. He would hiss at my hubby and he had to stop using that brand.
I also agreee about trying closing the window to see if this is being caused by something he smells from outside that is new and scary.
I also agreee about trying closing the window to see if this is being caused by something he smells from outside that is new and scary.