You want a postive based aggression dog trainer or even to get in an behaviourist as in board cerfified and not just one that thinks they know.
Sibling stuff is hard to work through and needs eyes on as to do you support one dog the aggressor or the one being attacked and you have to see it to know.
JL
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"The truth about an animal is far more beautiful than all the myths woven about it." Konrad Loranz |