Highly agressive toward other dogs...Seeking Advice
I have a rescued female GSD approximately 4 years in age. She was rescued at age 3 and little was known regarding her past. She was well behaved for the first 3-5 months of ownership and showed little/mild aggressive tendencies. She was somewhat ill when I adopted her as she appeared to have suffered chronic ear infections for the majority of her life. I discovered she had a food allergy and since correcting her diet she has been perfectly healthy.
Her first incident occurred while visiting family; another dog which has a very bothersome personality was continuously pestering my GSD, she ignored it for the first day or so. Then one evening my GSD approached the other dog while it was laying/sleeping and attacked it, biting the other dog's abdomen and drawing blood. The injuries where not severe and did not require stitches.
Since then she has to be always separated from all other dog regardless of size or age. This morning she had another incident where she bit a small dog on a leash. She bit the dog in the shoulder/scruff area and drew blood. The resulting injury will require stitches.
I have contacted trainers in my area to begin aggression mitigation and am also considering muzzling here in mean time when outdoors.
She has NOT bitten a human although she is wary of strangers and postures when new people enter the house.
I believe her behavioral problems stems from a serious lack of socialization.
My question is: Is it reasonable to believe that this behavior can be fixed?
Thank you very much for any info, thoughts, advice you may have to offer.