Spring
!!
So is that your question (re:dogs)?? Its really challenging to change that behavior, but its usually about the dog (Nina) not feeling safe, for whatever reason. I've begun using "training treats" (using an old "chalk bag" from rock climbing, so it can clip to my waist) with one of my dogs,and as soon as I'm aware that she's seen something which is stressing her, I give her treats and she's been very responsive to this!! It doesn't change the behavior, it just makes her have 2 reactions to the stimuli (1 protective/aggressive and 2 "ooh a treat!!" ) Not sure what you've tried but I've tried lots with this dog, and this is the best thing that worked
Greg