Are you able to take Buster with you? To see if they will take to each other? How is she with women? Does she have any training? Are you able to take her for a short walk on your own? Try giving her a dog treat. Is she gentle in taking it? How is she with toys?
We rescued a GSD male some years back. His name was Brighton. Beautiful pure bred red sable. He was ok for about a week. Got along fine with our other GSD and was fine with our cats. Then one day while walking him he tagged me real good and hard just below my knee.
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It was sudden and for no reason at all. There was no warning and no change in his body language. Afterwards he knew he did wrong. It was written all over his body language. I'm no stranger to getting tagged by GSD's but that's usually with a bite suit and sleeve. This however was very unusual.
Turns out the previous owner used an electric shock training collar on him. They neglected to tell us "how" they trained him using that collar. We checked his neck and there were many "bumps" all around his neck on his skin from the shock collar. Those should not be there even if an electric collar is used. So, that told us they had the power cranked on the collar. In other words they had no clue what they were doing or the proper way to use that collar. I am no fan of that kind of training. It doesn't have a place in training with any canine at all.
We took him up to Angie's place and tried unsuccessfully to work with him for about a month. Each time I wore a bite suit. I got tagged a few more times. Each time he knew he did wrong, body language. After much discussion with Angie and the other trainers we all decided putting him down was in his (and our) best interests.
That one still stings. Couldn't trust him though. I was ...... and really wanted to use an electric shock collar on his previous owners. Would have served them right in my book. We never dealt with rescues again.
I don't say any of that to scare you Skeebs. Wouldn't do that to you Bro, you know that. It's just "stuff" to keep in mind when it comes to rescues.