My guess would be EPI. That could also be exacerbating his dog aggression and reactivity.
Are you currently affiliated with a gsd rescue? I would not be placing a dog with those issues on my own. Actually, I would never place any dog on my own but you will need some money to get this dog emotionally and physically healthy.
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Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
http://www.dogster.com/dogs/693238
Gio & Varda, the krazy kittens
....In my heart:
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Massie
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