Hi there,
it's not in the nature of a dog to be spiteful. There is always an underlying reason for every behavior.
It sounds like he might have separation anxiety. If he tries to get out of every room you put him in when you are away than he is certainly not relaxed and chilled out, which indicates separation anxiety. Also the fact that he soils the house points towards that.
Having a dog door can be very handy, but it also lowers your status as the pack leader. Why?
Well, you should be in charge of when he goes outside. Outside is exciting, outside is where you hunt and play, so you should allow him access to that special area and he shouldn't be the one to choose.
Of course you have to be very responsible, when your dog shows you that he needs to go outside to relieve himself you should let him out immediatly. It's not nice forcing a dog to hold on for long periods of time.
You should try not to pay too much attention to your dog when you are at home for a while. There should always be times where you are in a different room and he can't get to you. That way he will learn that you being at home doesn't mean that it's always exciting times for him, in fact it can be just as boring as when you are not there.
Has your dog only recently started to soil the house indoors?
Was he house trained when you got him?
Have you had him vet checked to make sure that he hasn't got an infection or any other medical condition that coudl trigger the soiling?
Thanks
John
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