My grandmothers cat was locked up in the bedroom one day for a few hours and used the bathroom on the bed. Now thats understandable because he couldnt have access to the litter box. But he has done it about 3 or 4 others times on the bed. Why do you think he is doing this? There is a new kitten in the house but i dont think that would make that much of difference. He is a un-neutered male. Please help with some advice