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My GSD mix Nala (female) (https://my.embarkvet.com/dog/nala70) has been showing territorial aggression towards other dogs for the last 6 months or so. She is 1yr 2mos old currently.
Nala is mostly fine greeting other dogs outside in neutral territory. The only times we have observed her being aggressive is indoors. She grew up as a puppy with proper socializing we believe (other dogs and humans). Until recently, she has lived with two other dogs (GSD and Shit zu).
For example, last night my parents showed up with their pit bull/lab mix who Nala has never met before, we greeted them outdoors off leash and let them run around for awhile. The first minutes of greeting, Nala's hair on her back was noticeably risen, but after a few minutes that was gone. Following the initial greeting, there were no signs of aggression. Nala got bored after awhile and started playing with her ball and chewing on sticks. Once we brought them indoors, it seemed fine for a minute or two, then when the two dogs got close to each other, Nala turned aggressive, pouncing and attempting to bite the pit bull/lab mix. I got a bite wound myself from intervening.
This isn't the first time this has happened. She has done this to the two other dogs she has lived with. She plays all day with her best friend/house mate, a purebread GSD, Clyde, but come into the bedroom where she sleeps and sometimes she snaps at Clyde. She has also made moves towards the other dog in the house.
She goes after dogs big and small, male and female. She has shown this over her food, but has actually been better with that after some training, and feeding her out of site from other dogs.
I don't know what to do to solve this territorial aggression issue. Obviously bringing in a specialist would help, but what can I do in the meantime? I don't know how to work on the territory training as she becomes aggressive over an area instead of a material object or person
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