Hi there,

I have two cats that never leave the house, a male and a female.  Both
of the cats have been surgically sterilised so they cannot have
offspring.

Over the last few days, my female cat has been sat behind the front
door apparently "mesmorised" by something.  There's no glass or means
for her to see out.  Today, I noticed a rather strong urine odour from
behind the front door.  I think that perhaps a male cat is spraying on
the front door and the smell is entering the house. It's definately
comming from outside of the house and it really stinks.

Other than hermetically sealing the front door of the house, is there
anything I can do to stop this?  Is there anything I can put on or
near the front door that will repel the cat outside without affecting
the male and female cats inside the house?

Thanks in advance for any help.