If your 10yr jack russell dog bites you for the 4th time & you have to get stitches do you keep him or euthanize? He has separation anxiety with his owner & anytime someone knocks on the door, it triggers his aggression and he attacks (the owner). She has gotten stitches on her arm because that's usually what he goes for. He clenched his jaw and shook her arm. She needed several stitches.

He bit her 3 other times & received stitches once.
He is her baby & she loves him dearly. She tried trainers, shock collars, calming pads, doggie Prozac & xanex, herbal calming drops, etc.

What does she do? Euthanize? Rescue group? Live with it & pray it doesn't happen again?