a cat would bring more in WC, you don't watch enough cartoons.
Try isolating your dog at night in the room wherever the doggy door is. and on the other side of the doggy door try to isolate a say 3x3m space for him/her to piss or whatever, try to put chicken wire around the isolated space. keep this for around 3 weeks and see what happens.
this has happened to my cousin before and we tried this and it worked.
if this doesn't work, email that dr harry guy. seriously, that's what my cousin did and he gots a reply in around 1 week.
19/05/2008
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