Hi, We have 2 labradors a female neutered 7 years and a male aged 2 years. Yesterday when we had family round he really didn't like my brother in law. He howled/high pitched bark a bit like when he sees a cat in the garden or something. He's met him before a couple of times, his spine thing didn't go up, he's great generally but can be spooked on occasion by groups of males sometimes. Any ideas?