A new cat has moved into the neighbourhood and seems to have become obsessed with our house and cat. It sits outside the kitchen door staring in for sometimes hours on end, and if I so much as open the door it tries to get in. My poor little cat, who’s nervous by nature anyway, is becoming traumatised. I’m also worried about the summer when I like to have the back door open. I’ve tried scaring it off, squirting it repeatedly with water, and just ignoring. It runs away, but then comes straight back. Any ideas on anything else I can try?