First off, good fir you for taking a GSD with special needs!!! It is obvious you love her.
Now for the question, it is NOT your dogs responsibility to stand up for herself. It is YOUR responsibility to not allow another pack member to bully her.
She has been forced into a submissive position by a puppy and by your lack of intervention. A very submissive dog won't eat around very dominant dogs, they won't attempt to play it Hain control if an object if the dominant dog is there.
You need to step up and step in between your pit puppy and CORRECT the pit puppy for being a bully. No dog has the right to decide who YOU pet and interact with. You pay the bills, you buy the food, you decide who you let and for how long. Period.
Next, you girl needs to learn some confidence. Obedience training, agility, hiking, with her alone will let her find herself and build confidence. She needs to figure out how to be a strong dog without the bullying of a housemate. They need separate time with you.
Next. You need to get control of the pit puppy. They are already a strong pushy breed. Your pup needs to learn deference and self control, or when the time comes, and your GSD does assert herself, your pit will push back harder and fight will ensue. It us not a breed that can be allowed to make the rules.
All dogs in the house need individual training, interaction and appropriate direction.
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