We had similar problems with our dog who was also not socialized, just chained to a tree for all to abuse. The one thing that really helped along with consistant training techniques was a good massage after our walks. Not only did this seem to calm the aggression but it also helped us bond with her. This may also help with arthritic problems. But I do agree with others responses that this uncharacteristic change may be due to health problems??? Good luck.
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