Hey! I have a 15m old male BC. He gets along wonderfully with dogs and people. He can work while dogs work, watch dogs work (it’s intense, but he can), stand around ignoring dogs, run with them, walk with them.. anything, he’s great and well socialized… until.. one of his littermates enter the picture. He is then aggressively trying to get them! Barking, growling, hackles up… they leave, he’s fine.
ONLY his litter mates (he has seen 3 out of the 7 with the same reaction).
I am not worried about how to fix it, it’ll just take a bit longer since we don’t see each other too often.
I initially thought it was intensity.. but he’s great with some super intense BC’s with hard eyes… has anyone ever heard of this?