our 21 year old Siamese has lost the plot. She is pacing and pacing and hasn't got a clue where she is - gets stuck behing the video, walks all over things without realising, knocks things over. and yowls and yowls (Siamese tend to do the yowling thing anyway.) and she wees and poos every where. Sooner or later we are going to have to make a decision. The problem is that in many ways she's physically ok. How on earth do we know when she's had enough?