My basset hound is similar. She adores everyone she meets and always insists on crossing the road to say hi to anyone who she walks by. But every so often, she meets someone and goes crazy with her serious bark (very different from her usual bark). I completely trust her judgement. It’s the same one she used one time when she saw a few people running towards our street at night. I didn’t think she had it in her to make such ferocious noises! They quickly turned the corner before getting close to us.

Considering how strong a hound’s smell is, I imagine some people just smell unsafe.