I’m not fortress, but I’ve had some badly behaved dogs in my day so I consider myself somewhat of a subject expert. 😆
There is a whole spectrum of territorial. Do you mean it tears coyotes up ...
He is a combination of very well behaved and a great listener all the way to being aggressive and trying to rip the heads off of puppies and bunnies and harmless small things for apparently no reason I can see.
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