Sorry to hear about the incidents.
All these events are connected and accumulative.
The first 3-4 weeks dogs go through an adoption imprint period ( many call it decompression which I think is misleading) in this period dogs attempt to establish bonds and a secure attachment relationship (SAR)- with one person or dog.
SAR is the strongest type of attachment. A Dog in this category feels he can depend on his parent or provider. He knows that person will be there when he needs support. He knows what to expect.
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The secure dog usually plays well with people and other dogs his age.
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He may bark or whine when his caregiver leaves. He will usually settle down if a friendly person is there to comfort him.
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When caretaker pick him up from petcare, he is usually very happy to see them.
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He may have a hard time leaving pet-care, though. This can be confusing if the dog was upset when the parents left at the beginning of the day. It does not mean that the dog is not happy to see the caretaker.
In your case the sequence of events acculturated and the dog shifted into a insecure attachment relationship were the dog stopped relying on the caregiver and takes care of himself and others.
You’re dog has a trauma and does not trust you for his safety.
You are not alone many pet-parents end up in this situations, the dog becomes fear reactive ( fear aggression). In addition people may hire an inexperienced trainer and make things worse. This is likely the case why most dogs being relinquished; they lost their secure attachment and use their breed traits to take care of themselves.
This can be addressed by resetting the relationship and starting from scratch.
1. Establish SAR
2. Teach tasks, jobs and routines
3. Generalize the routines
4. Increase the stimulation
5. Work on the thresholds
6. Always offer appreciation for your dog’s achievements
I can help you with that remotely, I teach online classes and private sessions for rescues, behavior teams and fosters/adopters.
#PetBehaviorandTraining